Schedule II-Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 29, 2012
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning of period	$ 504		$ 937		$ 2,194
Charged to Costs and Expenses	(320)		(371)		(1,239)
Other Additions	0		0		0
Other Deductions	(41)	[1]	(62)	[1]	(18)	[1]
End of period	143		504		937
Inventory reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning of period	14,120		18,617		15,099
Charged to Costs and Expenses	3,060		3,561		6,060
Other Additions	0		0		0
Other Deductions	(3,317)	[2]	(8,058)	[2]	(2,542)	[2]
End of period	13,863		14,120		18,617
Valuation allowance for deferred taxes [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning of period	26,444		25,015		23,777
Charged to Costs and Expenses	(1,820)	[3]	1,429		1,261	[3]
Other Additions	0		0		0	[4]
Other Deductions	0		0		(23)
End of period	$ 24,624		$ 26,444		$ 25,015

[1] Represents write-offs of specific accounts receivable.

[2] Sale or scrap of previously reserved inventory.

[3] Reflects increase/decrease in the valuation allowance primarily associated with the Company's U.S. and foreign net operating losses and other deferred tax assets.

[4] Release of valuation allowance related to prior stock option exercises recorded to additional paid in capital.