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Supplemental Financial Information (Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Supplemental Financial Information [Abstract]    
Accrued compensation and benefits $ 34,519us-gaap_AccruedEmployeeBenefitsCurrent $ 36,708us-gaap_AccruedEmployeeBenefitsCurrent
Other accrued liabilities 39,616us-gaap_OtherAccruedLiabilitiesCurrent 27,549us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities $ 74,135us-gaap_AccruedLiabilitiesCurrent $ 64,257us-gaap_AccruedLiabilitiesCurrent