Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Mar. 28, 2015
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Mar. 29, 2014
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Mar. 28, 2015
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Mar. 29, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Allocated share-based compensation expense | $ 500,000us-gaap_AllocatedShareBasedCompensationExpense | $ 200,000us-gaap_AllocatedShareBasedCompensationExpense | $ 400,000us-gaap_AllocatedShareBasedCompensationExpense | $ 400,000us-gaap_AllocatedShareBasedCompensationExpense |
Exercises in period (shares) | 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 14,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | ||
Performance Shares [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Grants during the period(shares) |
169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
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Restricted Stock Units (RSUs) [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Grants during the period(shares) |
355,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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2010 Stock Plan [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Aggregate number of shares that may be delivered (shares) |
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dla_StockPlan2010Member |
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dla_StockPlan2010Member |
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Total compensation cost not yet recognized |
4,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = dla_StockPlan2010Member |
4,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = dla_StockPlan2010Member |
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Period for recognition | 3 years 8 months 12 days | |||
Option Plan [Member] | Stock Options [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
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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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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