Schedule of Derivatives Not Designated as Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jun. 26, 2011	Dec. 25, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 18.6		$ 18.3
Fair Value	0.1
Amount of Gain (Loss) Recognized In Income	0.2	0.6
Foreign Exchange Contracts | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	18.2		4.6
Fair Value	0.1
Foreign Exchange Contracts | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	0.4		13.7
Foreign Exchange Contracts | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income		(0.2)
Foreign Exchange Contracts | Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	$ 0.2	$ 0.8