Supplemental Financial Information (Goodwill) (Details) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Supplemental Financial Information [Abstract]
Goodwill, Beginning Balance	$ 278,849,000us-gaap_Goodwill	$ 252,419,000us-gaap_Goodwill
Goodwill recorded in connection with acquistions	4,390,000us-gaap_GoodwillAcquiredDuringPeriod	26,430,000us-gaap_GoodwillAcquiredDuringPeriod
Impairment loss			(267,600,000)us-gaap_GoodwillImpairmentLoss
Goodwill, Ending Balance	283,239,000us-gaap_Goodwill	278,849,000us-gaap_Goodwill	252,419,000us-gaap_Goodwill
Goodwill, Impaired, Accumulated Impairment Loss	536,600,000	536,600,000
Goodwill impairment			$ 267,600,000us-gaap_GoodwillImpairmentLoss

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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