Schedule II-Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 25, 2010
Allowance for doubtful accounts:
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 3,404,000	$ 1,314,000	$ 983,000
Acquisitions (Dispositions)	(299,000)	1,115,000	333,000
Charged to Costs and Expenses	3,197,000	2,584,000	610,000
Deductions	3,552,000	1,609,000	612,000
Balance at End of Period	2,750,000	3,404,000	1,314,000
Sales returns reserve:
Valuation and Qualifying Accounts
Balance at Beginning of Period	18,302,000	12,742,000	3,809,000
Acquisitions (Dispositions)			31,000
Charged to Costs and Expenses	107,436,000	64,457,000	40,139,000
Deductions	93,971,000	58,897,000	31,237,000
Balance at End of Period	31,767,000	18,302,000	12,742,000
Warranty reserve:
Valuation and Qualifying Accounts
Balance at Beginning of Period	14,728,000	6,694,000	724,000
Charged to Costs and Expenses	37,390,000	35,450,000	14,780,000
Deductions	31,900,000	27,416,000	8,810,000
Balance at End of Period	20,218,000	14,728,000	6,694,000
Warranty recoveries from suppliers	$ 8,300,000		$ 6,000,000