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    <link:label id="lab_us-gaap_RevenuesAbstract_6BF67D06CC651B8DA5ABA48895742A80_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_6BF67D06CC651B8DA5ABA48895742A80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
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    <link:label id="lab_us-gaap_SalesRevenueServicesNet_B33C73289103A155C4E1A4889575667C_label_en-US" xlink:label="lab_us-gaap_SalesRevenueServicesNet_B33C73289103A155C4E1A4889575667C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Revenue, Services, Net</link:label>
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    <link:label id="lab_us-gaap_FranchiseRevenue_AE18A566264C62C63DAEA4889575F731_label_en-US" xlink:label="lab_us-gaap_FranchiseRevenue_AE18A566264C62C63DAEA4889575F731" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Franchise Revenue</link:label>
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    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSoldAbstract_DD8A9FDB5078F79B37ADA488957526F0_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSoldAbstract_DD8A9FDB5078F79B37ADA488957526F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of operations</link:label>
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    <link:label id="lab_us-gaap_CostOfServicesDirectLabor_A3282DCFEDB49063E7B4A4889575C1B6_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectLabor_A3282DCFEDB49063E7B4A4889575C1B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Labor and related expenses</link:label>
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    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_DC749DDA3E6217810A9EA488957504B5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_DC749DDA3E6217810A9EA488957504B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Occupancy and other operating expenses</link:label>
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    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_4DA80AB9BA1E65C3A576A4889575F036_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_4DA80AB9BA1E65C3A576A4889575F036" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and Administrative Expense</link:label>
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    <link:label id="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualRepurchaseorRedemptionofQualifiedEntityInterests_FD2C050906FDED2F6844AE70A09D1494_terseLabel_en-US" xlink:label="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualRepurchaseorRedemptionofQualifiedEntityInterests_FD2C050906FDED2F6844AE70A09D1494" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restrictive covenants, maximum annual repurchase or redemption of qualified entity interests</link:label>
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    <link:label id="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans_BF312CC513394EE7962DAE70A09DC68A_terseLabel_en-US" xlink:label="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans_BF312CC513394EE7962DAE70A09DC68A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restrictive covenants, maximum annual payment for stock option plans, employment agreements and incentive plans</link:label>
    <link:label id="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans_BF312CC513394EE7962DAE70A09DC68A_label_en-US" xlink:label="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans_BF312CC513394EE7962DAE70A09DC68A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Restrictive Covenants, Maximum Annual Payment For Stock Option Plans, Employment Agreements and Incentive Plans</link:label>
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    <link:loc xlink:href="loco-20170628.xsd#loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans" xlink:label="loc_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForStockOptionPlansEmploymentAgreementsandIncentivePlans_BF312CC513394EE7962DAE70A09DC68A" xlink:type="locator" />
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    <link:label id="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForOtherRestrictedPayments_B207E58417259EB7B92BAE70A09DEBB6_terseLabel_en-US" xlink:label="lab_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForOtherRestrictedPayments_B207E58417259EB7B92BAE70A09DEBB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restrictive covenants, maximum annual payment for other restricted payments</link:label>
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    <link:loc xlink:href="loco-20170628.xsd#loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForOtherRestrictedPayments" xlink:label="loc_loco_DebtInstrumentRestrictiveCovenantsMaximumAnnualPaymentForOtherRestrictedPayments_B207E58417259EB7B92BAE70A09DEBB6" xlink:type="locator" />
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    <link:label id="lab_loco_DebtInstrumentCovenantDescriptionMaximumLeverageRatio_5594CB732F4EE3E9B087AE70A09EA8FA_terseLabel_en-US" xlink:label="lab_loco_DebtInstrumentCovenantDescriptionMaximumLeverageRatio_5594CB732F4EE3E9B087AE70A09EA8FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum leverage ratio</link:label>
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    <link:loc xlink:href="loco-20170628.xsd#loco_DebtInstrumentCovenantDescriptionMaximumLeverageRatio" xlink:label="loc_loco_DebtInstrumentCovenantDescriptionMaximumLeverageRatio_5594CB732F4EE3E9B087AE70A09EA8FA" xlink:type="locator" />
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    <link:label id="lab_loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio_3855735057613925C3C5AE70A09E333F_terseLabel_en-US" xlink:label="lab_loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio_3855735057613925C3C5AE70A09E333F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant description, coverage ratio</link:label>
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    <link:label id="lab_loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio_3855735057613925C3C5AE70A09E333F_documentation_en-US" xlink:label="lab_loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio_3855735057613925C3C5AE70A09E333F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant Description, Minimum Coverage Ratio</link:label>
    <link:loc xlink:href="loco-20170628.xsd#loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio" xlink:label="loc_loco_DebtInstrumentCovenantDescriptionMinimumCoverageRatio_3855735057613925C3C5AE70A09E333F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_2176F874D6263231EA7DAE70A09E825D_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_2176F874D6263231EA7DAE70A09E825D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total amount of outstanding debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_2176F874D6263231EA7DAE70A09E825D_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_2176F874D6263231EA7DAE70A09E825D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt and Capital Lease Obligations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_2176F874D6263231EA7DAE70A09E825D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7F77B26E183CB79052C4AE70A09E5970_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7F77B26E183CB79052C4AE70A09E5970" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash available</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7F77B26E183CB79052C4AE70A09E5970_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7F77B26E183CB79052C4AE70A09E5970" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_EFC9080E5D295B58F82AAE70A09E4306_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_EFC9080E5D295B58F82AAE70A09E4306" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of borrowings available</link:label>
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    <link:label id="lab_loco_NumberOfRestaurantsDamagedByFire_2267167CC0DA291DA9D0AE70A09E490F_terseLabel_en-US" xlink:label="lab_loco_NumberOfRestaurantsDamagedByFire_2267167CC0DA291DA9D0AE70A09E490F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of restaurants damaged</link:label>
    <link:label id="lab_loco_NumberOfRestaurantsDamagedByFire_2267167CC0DA291DA9D0AE70A09E490F_label_en-US" xlink:label="lab_loco_NumberOfRestaurantsDamagedByFire_2267167CC0DA291DA9D0AE70A09E490F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Restaurants Damaged By Fire</link:label>
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    <link:label id="lab_loco_Expensesincurredfromfiredamage_97F570ECC95A194D9669AE70A09E72F8_terseLabel_en-US" xlink:label="lab_loco_Expensesincurredfromfiredamage_97F570ECC95A194D9669AE70A09E72F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expenses incurred from fire damage</link:label>
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    <link:label id="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_94B647D1335780978F4AAE70A09E4BF1_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_94B647D1335780978F4AAE70A09E4BF1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Disposals</link:label>
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    <link:label id="lab_us-gaap_GeneralInsuranceExpense_0D3C0B6E792527AD7838AE70A09EFEB1_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralInsuranceExpense_0D3C0B6E792527AD7838AE70A09EFEB1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Costs incurred directly related to fire (less than $0.1 million)</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromInsurancePremiumsCollected_98FAB4A846AE03EFD926AE70A09E4F6B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromInsurancePremiumsCollected_98FAB4A846AE03EFD926AE70A09E4F6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount received from insurance company in cash</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_E7CBDB9EF41F3FFB50F4AE70A09FFB28_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_E7CBDB9EF41F3FFB50F4AE70A09FFB28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease obligations</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxAssetsNet_01E2ED75BAF6A4563B3CAE70A09FC0F9_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxAssetsNet_01E2ED75BAF6A4563B3CAE70A09FC0F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax assets</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_7E8E209999E3369C52F6AE70A09F26AD_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_7E8E209999E3369C52F6AE70A09F26AD" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Amount reclassified out of deferred tax assets, current</link:label>
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    <link:label id="lab_us-gaap_PrepaidExpenseCurrentAndNoncurrent_DA28335F585D1CDAE11AAE70A09F0623_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrentAndNoncurrent_DA28335F585D1CDAE11AAE70A09F0623" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre-payment for new restaurant</link:label>
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    <link:label id="lab_loco_NumberOfSuppliers_01134D27D7EC90DC0F5FAE70A09F2701_terseLabel_en-US" xlink:label="lab_loco_NumberOfSuppliers_01134D27D7EC90DC0F5FAE70A09F2701" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of suppliers</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskPercentage1_F386E7019219575FD951AE70A09F2627_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1_F386E7019219575FD951AE70A09F2627" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of concentration</link:label>
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_53E36F0AD20B705B432FAE70A09F543D_terseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_53E36F0AD20B705B432FAE70A09F543D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset impairment charges</link:label>
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    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_003039A2839E81CAD6CAAE70A09F02F4_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_003039A2839E81CAD6CAAE70A09F02F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized tax benefits, accrual of interest or penalties</link:label>
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    <link:label id="lab_loco_PercentageOfOperatingLossCarryforwardsTaxSavingsPayableToPreInitialPublicOfferingStockholders_4FF2C00E874B7E40EDE3AE70A0A451CE_terseLabel_en-US" xlink:label="lab_loco_PercentageOfOperatingLossCarryforwardsTaxSavingsPayableToPreInitialPublicOfferingStockholders_4FF2C00E874B7E40EDE3AE70A0A451CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of cash savings in taxes realized as a result of utilizing net operating losses payable to pre-IPO stockholders</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_B086201716AE96E0E10B9EAA39451FB8_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_B086201716AE96E0E10B9EAA39451FB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_B086201716AE96E0E10B9EAA39451FB8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Depreciation_47B9CEE34B0820F05B039EAA39457E74_terseLabel_en-US" xlink:label="lab_us-gaap_Depreciation_47B9CEE34B0820F05B039EAA39457E74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation expense</link:label>
    <link:label id="lab_us-gaap_Depreciation_47B9CEE34B0820F05B039EAA39457E74_label_en-US" xlink:label="lab_us-gaap_Depreciation_47B9CEE34B0820F05B039EAA39457E74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
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    <link:label id="lab_us-gaap_CapitalLeasedAssetsGross_6D7005D7F4DF6B78279A9EAA39454286_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasedAssetsGross_6D7005D7F4DF6B78279A9EAA39454286" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross value of assets under capital leases for buildings and improvements</link:label>
    <link:label id="lab_us-gaap_CapitalLeasedAssetsGross_6D7005D7F4DF6B78279A9EAA39454286_label_en-US" xlink:label="lab_us-gaap_CapitalLeasedAssetsGross_6D7005D7F4DF6B78279A9EAA39454286" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leased Assets, Gross</link:label>
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    <link:label id="lab_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_A6FF1252EF9522B5DB119EAA3946AB40_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_A6FF1252EF9522B5DB119EAA3946AB40" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated depreciation of assets under capital leases</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_A6FF1252EF9522B5DB119EAA3946AB40_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_A6FF1252EF9522B5DB119EAA3946AB40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation" xlink:label="loc_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_A6FF1252EF9522B5DB119EAA3946AB40" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssets_A6678C1843A66844E7589EAA39469114_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssets_A6678C1843A66844E7589EAA39469114" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssets_A6678C1843A66844E7589EAA39469114_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssets_A6678C1843A66844E7589EAA39469114" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Productive Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_A6678C1843A66844E7589EAA39469114" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForCapitalImprovements_68B0EFFDE09E689ADA589EAA3946D840_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_68B0EFFDE09E689ADA589EAA3946D840" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures for restaurant remodeling</link:label>
    <link:label id="lab_us-gaap_PaymentsForCapitalImprovements_68B0EFFDE09E689ADA589EAA3946D840_label_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_68B0EFFDE09E689ADA589EAA3946D840" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Capital Improvements</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsForCapitalImprovements" xlink:label="loc_us-gaap_PaymentsForCapitalImprovements_68B0EFFDE09E689ADA589EAA3946D840" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures for new restaurants</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Other Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847" xlink:to="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_99AE9D5FDC0A914B805F9EAA39467847" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingCashFlowsDirectMethodAbstract_33ABE562C1BF2C4C4C6DA9EC7DAF0CE5_label_en-US" xlink:label="lab_us-gaap_OperatingCashFlowsDirectMethodAbstract_33ABE562C1BF2C4C4C6DA9EC7DAF0CE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Cash Flows, Direct Method [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_5AA170253847C929D9AFA9EC7DAFDCFE_verboseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_5AA170253847C929D9AFA9EC7DAFDCFE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Impairment of Long-Lived Assets Held-for-use</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4848E4170C4233BA590FA9EC7DB0714F_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4848E4170C4233BA590FA9EC7DB0714F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_3374BB6914EABD5A08C1A9EC7DB050D2_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_3374BB6914EABD5A08C1A9EC7DB050D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91A7A1EA6EAC5F16E6CBA9EC7DB0D9FB_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91A7A1EA6EAC5F16E6CBA9EC7DB0D9FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash flows provided by operating activities:</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensation_C16486064F94BFB5FE90A9EC7DB0722D_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_C16486064F94BFB5FE90A9EC7DB0722D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromInsuranceSettlementOperatingActivities_7E1DCF6200EB791114A0A9EC7DB0441D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromInsuranceSettlementOperatingActivities_7E1DCF6200EB791114A0A9EC7DB0441D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fire insurance proceeds for expenses paid and lost profit</link:label>
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    <link:label id="lab_us-gaap_RestructuringCosts_E29C6B637ED1074DD4ECA9EC7DB13477_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCosts_E29C6B637ED1074DD4ECA9EC7DB13477" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Closed-store reserve</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_9E248CEC1811F76683D1A9EC7DB1B41C_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_9E248CEC1811F76683D1A9EC7DB1B41C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfAboveAndBelowMarketLeases_83C056082355EBC46E37A9EC7DB1EC34_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfAboveAndBelowMarketLeases_83C056082355EBC46E37A9EC7DB1EC34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of favorable and unfavorable leases, net</link:label>
    <link:label id="lab_us-gaap_AmortizationOfAboveAndBelowMarketLeases_83C056082355EBC46E37A9EC7DB1EC34_label_en-US" xlink:label="lab_us-gaap_AmortizationOfAboveAndBelowMarketLeases_83C056082355EBC46E37A9EC7DB1EC34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of above and below Market Leases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AmortizationOfAboveAndBelowMarketLeases" xlink:label="loc_us-gaap_AmortizationOfAboveAndBelowMarketLeases_83C056082355EBC46E37A9EC7DB1EC34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B896C8C095238CCE63D5A9EC7DB1508D_negatedLabel_en-US" xlink:label="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B896C8C095238CCE63D5A9EC7DB1508D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Excess income tax benefit related to share-based compensation plans</link:label>
    <link:label id="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B896C8C095238CCE63D5A9EC7DB1508D_label_en-US" xlink:label="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B896C8C095238CCE63D5A9EC7DB1508D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Excess Tax Benefit from Share-based Compensation, Operating Activities</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_D8FA203BCEEC194B6690A9EC7DB16784_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_D8FA203BCEEC194B6690A9EC7DB16784" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADD47523E4007B28F6FA9EC7DB10802_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADD47523E4007B28F6FA9EC7DB10802" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_A242C9CBACD01809F0ADA9EC7DB104FF_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_A242C9CBACD01809F0ADA9EC7DB104FF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Accounts and other receivables, net</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_A242C9CBACD01809F0ADA9EC7DB104FF" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_96A67873B21FBE316895A9EC7DB1CDC6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_332A70DB47AF667F54D2A9EC7DB1871B_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_332A70DB47AF667F54D2A9EC7DB1871B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_332A70DB47AF667F54D2A9EC7DB1871B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5A21E8A3FE7CE5ECE17CA9EC7DB1C001_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5A21E8A3FE7CE5ECE17CA9EC7DB1C001" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other assets</link:label>
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    <link:label id="lab_us-gaap_OfficerMember_893C2DEB95BBF0B07200CF123FF53622_terseLabel_en-US" xlink:label="lab_us-gaap_OfficerMember_120C73DAE719564380F84DAE75BFA4E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Officers</link:label>
    <link:label id="lab_us-gaap_OfficerMember_893C2DEB95BBF0B07200CF123FF53622_label_en-US" xlink:label="lab_us-gaap_OfficerMember_120C73DAE719564380F84DAE75BFA4E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Officer [Member]</link:label>
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    <link:label id="lab_us-gaap_OtherCommitmentsLineItems_185245042C24CB358ADFCF123FF5882D_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsLineItems_AAA58681394E5BB8AB3DA3F4FB43C71B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Line Items]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsLineItems_185245042C24CB358ADFCF123FF5882D_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsLineItems_AAA58681394E5BB8AB3DA3F4FB43C71B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherCommitmentsLineItems" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_AAA58681394E5BB8AB3DA3F4FB43C71B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingencyLawsuitFilingDate_BBA4BEC6C47BCA1D9550CF123FF51106_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyLawsuitFilingDate_575678D884EA503CABD7185C2233CF46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Date of class action filed in court</link:label>
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    <link:label id="lab_loco_NumberOfLawsuits_A74DFA03557A1AB422DBCF123FF59724_terseLabel_en-US" xlink:label="lab_loco_NumberOfLawsuits_50ED9758EC515120B93F186AE8FF36A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of lawsuits consolidated</link:label>
    <link:label id="lab_loco_NumberOfLawsuits_A74DFA03557A1AB422DBCF123FF59724_label_en-US" xlink:label="lab_loco_NumberOfLawsuits_50ED9758EC515120B93F186AE8FF36A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Lawsuits</link:label>
    <link:label id="lab_loco_NumberOfLawsuits_A74DFA03557A1AB422DBCF123FF59724_documentation_en-US" xlink:label="lab_loco_NumberOfLawsuits_50ED9758EC515120B93F186AE8FF36A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of lawsuits.</link:label>
    <link:loc xlink:href="loco-20170628.xsd#loco_NumberOfLawsuits" xlink:label="loc_loco_NumberOfLawsuits_50ED9758EC515120B93F186AE8FF36A7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligation_4BC29576FC312DBE0E09CF123FF5E416_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligation_DA3C5BE9C01E555A95F74A6C2DCCE527" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase commitments, estimated obligations</link:label>
    <link:label id="lab_us-gaap_PurchaseObligation_4BC29576FC312DBE0E09CF123FF5E416_label_en-US" xlink:label="lab_us-gaap_PurchaseObligation_DA3C5BE9C01E555A95F74A6C2DCCE527" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligation" xlink:label="loc_us-gaap_PurchaseObligation_DA3C5BE9C01E555A95F74A6C2DCCE527" xlink:type="locator" />
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    <link:label id="lab_loco_NumberOfLeases_2F12DA56E2694E0535BACF123FF52C15_terseLabel_en-US" xlink:label="lab_loco_NumberOfLeases_7D81D304550F5CD5A5A255C8C35B819D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of leases assigned to franchisees</link:label>
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    <link:loc xlink:href="loco-20170628.xsd#loco_NumberOfLeases" xlink:label="loc_loco_NumberOfLeases_7D81D304550F5CD5A5A255C8C35B819D" xlink:type="locator" />
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    <link:loc xlink:href="loco-20170628.xsd#loco_LeaseExpirationYear" xlink:label="loc_loco_LeaseExpirationYear_671D22B2B5DF510D9C2C0436A2DD358C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GuaranteeObligationsMaximumExposure_EE073D58ED1CA03B295CCF123FF5E8AA_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMaximumExposure_A4B5F362CE385E58B5B668E874586886" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contingent lease obligations, maximum exposure</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_A4B5F362CE385E58B5B668E874586886" xlink:type="locator" />
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    <link:label id="lab_loco_NumberOfEmploymentAgreements_718F63038D9FD8096F58CF123FF56072_terseLabel_en-US" xlink:label="lab_loco_NumberOfEmploymentAgreements_A78642EE56065532B46089C25080861D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of at-will employment agreements</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FF6357EC6BCDE31DCBB29EE9D900A2B0_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FF6357EC6BCDE31DCBB29EE9D900A2B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_453E0C8EA014B4324F529EE9D900ED8E_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_453E0C8EA014B4324F529EE9D900ED8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CapitalLeaseObligationsCurrent_E67F3B4148B3A5162D979EE9D900142A_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsCurrent_E67F3B4148B3A5162D979EE9D900142A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current portion of obligations under capital leases</link:label>
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