Schedule of Fair Value of Assets and Liabilities (Detail) (Fair Value Measurements, Recurring, USD $) In Millions, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 7.9	$ 0.9
Liabilities	(0.9)	(6.4)
Total foreign currency derivatives	7.0	(5.5)
Securities	2.7	32.5
Marketable Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	2.7	2.7
Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities		29.8
Fair Value, Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	2.7	2.7
Fair Value, Quoted Prices In Active Markets (Level 1) | Marketable Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	2.7	2.7
Fair Value, Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	7.9	0.9
Liabilities	(0.9)	(6.4)
Total foreign currency derivatives	7.0	(5.5)
Fair Value, Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities		29.8
Fair Value, Significant Unobservable Inputs (Level 3) | Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities		$ 29.8