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Goodwill and Other Intangible Assets, Net (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Goodwill And Other Intangible Assets Net (Textual) [Abstract]
Amortization expense	$ 4.8	$ 5.0	$ 9.6	$ 9.1
Facility Management Contracts [Member]
Goodwill And Other Intangible Assets Net (Textual) [Abstract]
Weighted average period			1.7

For intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination) which have renewal or extension terms, this element represents the weighted-average period prior to the next renewal or extension (both explicit and implicit), by major intangible asset class.

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