Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Allowance for Doubtful Accounts, Current [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 30,209	$ 36,485	$ 33,838
Additions charged to operating cost-net	10,531	20,326	59,367
Deductions	22,103	26,602	56,720
Balance at end of period	18,637	30,209	36,485
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	0	0	1,156
Additions charged to operating cost-net	39,824	0	0
Deductions	0	0	1,156
Balance at end of period	$ 39,824	$ 0	$ 0