Commitments and Contingent Liabilities - Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 19,000,000	$ 18,000,000	$ 22,000,000
2013	14,054,000
2014	12,724,000
2015	10,434,000
2016	8,591,000
2017	4,651,000
Later years	10,284,000
Total minimum lease payments	60,738,000
Less: noncancelable subleases	(12,451,000)
Total minimum lease payments, net of noncancelable subleases	$ 48,287,000