Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 30, 2011	Dec. 31, 2010	Jan. 01, 2010
Commitments And Contingencies [Abstract]
Net rent expense under operating leases	$ 23.5	$ 19.2	$ 18.0
Acquisition-related holdbacks as non-current liabilities	5.7
Fair value of the contingent consideration	5.0
Additional potential earn-out cash payments	11.2
Unconditional purchase obligations	$ 86.1

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details

- Definition

The carrying amount of the long-term purchase obligation as of the balance sheet date, which equals the sum of all payments due.

+ References+ Details