Income Taxes - Additional Information (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Dec. 26, 2010
Income Taxes [Line Items]
Total amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	$ 69.4		$ 69.4	$ 108.7
Total amount of unrecognized tax benefits, excluding the federal tax benefit of state tax deductions	101.4		101.4	153.5
Decrease in unrecognized tax benefits			52.1
Unrecognized tax benefits, reduction for the lapses of statutes of limitations			4.5
Unrecognized tax benefits, reductions for prior year tax positions			43.1
Unrecognized tax benefits, state audit settlements			15.6
Unrecognized tax benefits, increase for prior year tax positions			4.6
Unrecognized tax benefits, increase for current year tax positions			6.5
Interest and penalty (benefit) expense	(6.2)	0.2
Net accrued interest and penalties related to uncertain tax benefits	34.1		34.1	36.5
Estimated amount of gross unrecognized tax positions that may decrease within the next 12 months	$ 34.3		$ 34.3
Federal
Income Taxes [Line Items]
Tax years subject to examination			The 2009 through 2010 tax years remain subject to examination by the IRS
State
Income Taxes [Line Items]
Tax years subject to examination			The 2005 through 2010 tax years generally remain subject to examination by state authorities
United Kingdom
Income Taxes [Line Items]
Tax years subject to examination			The years 2009-2010 are subject to examination in the UK