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Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Net rent expense under operating leases	$ 28.2	$ 23.5	$ 19.2
Unconditional purchase obligations	$ 94.4

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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