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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- 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

X

- 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