Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2012	Dec. 30, 2011
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 6,318	$ 6,689
Accounts receivable, sales return reserve	$ 2,763	$ 1,767
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	3,000	3,000
Preferred stock, shares outstanding	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	180,000	180,000
Common stock, shares issued	127,243	123,663
Common stock, shares outstanding	127,243	123,663