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Derivatives and Fair Value Measurements (Details) (USD $)
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Mar. 28, 2015
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Sep. 27, 2014
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Accrued contingent consideration |
$ 3,700,000us-gaap_BusinessCombinationContingentConsiderationAsset
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| Deferred Tax Liabilities [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Derivatives related to interest rate swap agreements |
(249,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= dla_DeferredTaxLiabilitiesMember
|
(168,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= dla_DeferredTaxLiabilitiesMember
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| Other Liabilities [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Derivatives related to interest rate swap agreements |
(647,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
|
(437,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
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| Accumulated Other Comprehensive Loss [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Derivatives related to interest rate swap agreements |
(398,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
|
(269,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
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| Maturity Date 9/9/2016 [Member] |
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| Interest Rate Derivatives [Abstract] |
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| Notational Amount |
15,000,000invest_DerivativeNotionalAmount
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember92016Member
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| Fixed LIBOR Rate |
1.17%us-gaap_DerivativeFixedInterestRate
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember92016Member
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| Maturity Date 9/11/2017 [Member] |
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| Interest Rate Derivatives [Abstract] |
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| Notational Amount |
15,000,000invest_DerivativeNotionalAmount
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember112017Member
|
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| Fixed LIBOR Rate |
1.648%us-gaap_DerivativeFixedInterestRate
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember112017Member
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| Maturity Date 9/19/2016 [Member] |
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| Interest Rate Derivatives [Abstract] |
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| Notational Amount |
15,000,000invest_DerivativeNotionalAmount
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInsturmentMaturityDateSeptember192016Member
|
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| Fixed LIBOR Rate |
1.003%us-gaap_DerivativeFixedInterestRate
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInsturmentMaturityDateSeptember192016Member
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| Maturity Date 9/19/2017 [Member] |
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| Interest Rate Derivatives [Abstract] |
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| Notational Amount |
15,000,000invest_DerivativeNotionalAmount
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember192017Member
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| Fixed LIBOR Rate |
1.449%us-gaap_DerivativeFixedInterestRate
/ dla_DerivativeInstrumentsByMaturityDateAxis
= dla_DerivativeInstrumentMaturityDateSeptember192017Member
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| Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Financial derivative liabilities, fair value |
(647,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
(437,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Contingent Consideration Contract [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Financial derivative liabilities, fair value |
(3,730,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
(3,600,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
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| Financial derivative liabilities, fair value |
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Contingent Consideration Contract [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
|
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| Financial derivative liabilities, fair value |
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
| Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
|
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| Financial derivative liabilities, fair value |
(647,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
(437,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
| Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Contingent Consideration Contract [Member] |
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
|
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| Financial derivative liabilities, fair value |
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swaps [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
|
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| Financial derivative liabilities, fair value |
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
| Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration Contract [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |
|
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| Financial derivative liabilities, fair value |
$ (3,730,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
$ (3,600,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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