Valuation and Qualiifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	$ 785	$ 1,177	$ 2,845
Valuation Allowances and Reserves, Charged to Cost and Expense	255	255	728
Valuation Allowances and Reserves, Deductions	(519)	(967)	(2,396)
Valuation Allowances and Reserves, Charged to Other Accounts	0	320	0
Valuation Allowances and Reserves, Ending Balance	521	785	1,177
Allowance for Sales Returns [Member]
Valuation And Qualifying Accounts [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	3,295	1,252	1,766
Valuation Allowances and Reserves, Charged to Cost and Expense	8,453	4,627	2,130
Valuation Allowances and Reserves, Deductions	(6,098)	(3,398)	(2,644)
Valuation Allowances and Reserves, Charged to Other Accounts	707	814	0
Valuation Allowances and Reserves, Ending Balance	6,357	3,295	1,252
Inventory Valuation Reserve [Member]
Valuation And Qualifying Accounts [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	11,452	11,800	11,710
Valuation Allowances and Reserves, Charged to Cost and Expense	6,590	6,435	7,259
Valuation Allowances and Reserves, Deductions	(7,596)	(6,783)	(7,169)
Valuation Allowances and Reserves, Charged to Other Accounts	7,848	0	0
Valuation Allowances and Reserves, Ending Balance	$ 18,294	$ 11,452	$ 11,800