Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 348	$ 397	$ 302
Additions charged to costs and expenses	776	246	275
Deductions from reserves	(699)	(295)	(180)
Balance at end of period	425	348	397
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	5,330	4,402	2,944
Additions charged to costs and expenses	59,656	44,284	40,449
Deductions from reserves	(55,553)	(43,356)	(38,991)
Balance at end of period	$ 9,433	$ 5,330	$ 4,402