Fair Value Measurements (Details) (USD $)	Mar. 26, 2013	Dec. 25, 2012
Fair Value Measurements
Transfer of asset levels within the fair value hierarchy	$ 0
Transfer of liability levels within the fair value hierarchy	0
Fair value of financial instruments
Interest rate swaps	(3,696,000)	(4,016,000)
Fair value measured on a recurring basis \| Level 1
Fair value of financial instruments
Deferred compensation plan - assets	10,132,000	9,145,000
Deferred compensation plan - liabilities	(10,123,000)	(9,160,000)
Fair value measured on a recurring basis \| Level 2
Fair value of financial instruments
Interest rate swaps	$ (3,696,000)	$ (4,016,000)

Amount of transfers of assets measured on a recurring basis levels within the fair value hierarchy.

No definition available.

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- Definition

Amount of transfers of liabilities measured on a recurring basis levels within the fair value hierarchy.

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

+ Details

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-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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