Derivatives (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011	Dec. 25, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 14.4		$ 18.3
Fair Value
Amount of Gain (Loss) Recognized In Income	0.5	0.3
Foreign Exchange Contracts [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	0.1	(0.1)
Foreign Exchange Contracts [Member] | Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	0.4	0.4
Foreign Exchange Contracts [Member] | Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	9.6		4.6
Fair Value
Foreign Exchange Contracts [Member] | Current Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	4.8		13.7
Fair Value