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Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Dec. 27, 2014
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Dec. 28, 2013
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Sep. 29, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercises in period (shares) |
14,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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| Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
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| 2010 Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Decrease in stock compensation expense |
100,000dla_IncreaseDecreaseinStockCompensationExpense
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| Allocated share-based compensation expense |
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200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| Total compensation cost not yet recognized |
5,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| Period for recognition |
4 years
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| Aggregate number of shares that may be delivered (shares) |
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| 2010 Stock Plan [Member] | Performance Awards, One Year Vesting Period, Issued Upon Annual Report Filing [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |
52,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= dla_PerformanceAwardsOneYearVestingPeriodIssuedUponAnnualReportFilingMember
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| 2010 Stock Plan [Member] | Restricted Stock Units (RSUs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
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355,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
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| Option Plan [Member] | Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Allocated share-based compensation expense |
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= dla_OptionPlanMember
|
$ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= dla_OptionPlanMember
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| Oct 3, 2015 [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= dla_OctoberThirdTwentyFifteenMember
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| FY 2016 and 2017 [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
104,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= dla_FiscalYearTwentySixteenandTwentySeventeenMember
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| Oct 1, 2016 [Member] | 2010 Stock Plan [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
52,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
/ us-gaap_VestingAxis
= dla_OctoberFirstTwentySixteenMember
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| Sept 20, 2017 [Member] | 2010 Stock Plan [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grants in period (shares) |
52,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= dla_StockPlan2010Member
/ us-gaap_VestingAxis
= dla_SeptemberThirtyTwentySeventeenMember
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