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Long-Term Debt (Details) (Credit Facility Due April 2017 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 27, 2013	Apr. 13, 2012	Mar. 27, 2013 Secured Debt [Member]	Dec. 26, 2012 Secured Debt [Member]	Mar. 27, 2013 Senior secured revolver [Member]	Mar. 27, 2013 Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 190		$ 60	$ 30
Commitment fee for unused portion of revolving credit facility (in hundredths)					0.375%
Basis spread on variable rate debt			2.75%
Maturity date	Apr. 12, 2017
Amount of annual principal payments on term loan, payable in equal quarterly installments	19.0
Interest rate cap, description of variable rate basis	LIBOR
Interest rate cap, basis spread on variable rate		2.00%
Interest rate cap notional amount for the first year		150
Interest rate cap notional amount for the second year		125
Outstanding amount under credit facility			166.0		0
Outstanding amount of letters of credit						25.2
Availability under the revolving facility					34.8
Weighted-average interest rate under the term loan (in hundredths)			2.96%	2.97%
Repayments of term loan under the credit facility	$ 4.0

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- Definition

Aggregate notional amount specified in the interst rate cap during the first year.

+ References

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- Definition

Aggregate notional amount specified in the interst rate cap during the second year.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of the required periodic payments applied to principal.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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No definition available.

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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.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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-Section 02

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.

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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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