Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Jan. 01, 2010
Valuation And Qualifying Accounts [Abstract]
Balance at beginning of period	$ 3,442	$ 3,875	$ 5,999
Acquired allowance	3,678	1,380	114
Bad debt expense	1,913	2,320	4,139
Write-offs, net of recoveries	(2,344)	(4,133)	(6,377)
Balance at end of period	$ 6,689	$ 3,442	$ 3,875