Acquisitions And Pending Acquisition (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Dec. 31, 2011	Apr. 10, 2012 Pending Acquisition [Member] X-Rite [Member]	Dec. 31, 2011 Pending Acquisition [Member] X-Rite [Member]
Net cash consideration	$ 55,727,000	$ 517,420,000
Aggregate annual sales of additional businesses			25,000,000
Goodwill related to acquisitions	17,000,000
Businesses acquired	3
Date entered into a definitive agreement				April 10, 2012
Cash offer of outstanding shares of common stock				$ 5.55
Approximate aggregate purchase price				625,000,000
Pending acquisition, revenue reported by entity for last annual period					$ 238,000,000