Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Compensation and Retirement Disclosure [Abstract]
Company's contributions to defined-contribution plans	$ 5.1	$ 7.3	$ 5.9

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration