Product Warranties (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 25, 2011	Jun. 26, 2010	Jun. 25, 2011	Jun. 26, 2010	Mar. 26, 2011	Sep. 25, 2010	Mar. 27, 2010	Sep. 26, 2009
Product Warranties
Provision charged to income	$ 6,177,000	$ (423,000)	$ 27,788,000	$ 8,292,000
Usage, net of recoveries	(6,837,000)	1,242,000	(19,427,000)	(4,919,000)
Balance, end of period	15,055,000	4,097,000	15,055,000	4,097,000	15,715,000	6,694,000	3,278,000	724,000
Reimbursement From Suppliers Related To Warranty issues		$ 6,000,000