v2.4.0.6

Derivative Instruments and Hedging Activities - Additional Information (Detail) (Interest rate contract [Member], USD $) In Thousands, unless otherwise specified | 1 Months Ended |
--- | --- | ---
Jan. 31, 2011 | Sep. 29, 2012
Interest rate contract [Member] |  |
Derivative [Line Items] |  |
Initial notional amount on interest rate contract | $ 15,000 |
Maturity date | Mar. 01, 2016 |
Fixed interest rate | 3.94% |
Variable interest rate terms | LIBOR |
Variable interest rate | 1.85% |
Required notional amount for interest rate contract | 50.00% |
Pre-tax earnings within the next twelve months |  | $ 186

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- Definition Derivative notional amount percent of term loan. + References No definition available. + Details
Name: | dfz_DerivativeNotionalAmountPercentOfTermLoan
Namespace Prefix: | dfz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate cash flow hedge pre-tax gain loss to be reclassified during next twelve months. + References No definition available. + Details
Name: | dfz_InterestRateCashFlowHedgePretaxGainLossToBeReclassifiedDuringNextTwelveMonths
Namespace Prefix: | dfz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DerivativeDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable interest rate in effect as of the balance sheet date related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant