Schedule II-Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Allowance for Doubtful Accounts [Member]
Movement in valuation and qualifying accounts [Roll Forward]
Balance, beginning of period	$ 302	$ 379	$ 713
Additions charged to costs and expenses	275	197	138
Deductions from reserves	180	274	472
Balance, end of period	397	302	379
Accrued Sales Returns [Member]
Movement in valuation and qualifying accounts [Roll Forward]
Balance, beginning of period	2,944	2,885	2,744
Additions charged to costs and expenses	40,449	29,885	25,920
Deductions from reserves	38,991	29,826	25,779
Balance, end of period	$ 4,402	$ 2,944	$ 2,885