Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $)	6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Oct. 01, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 3,200,000	$ 4,400,000
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	75,680,000		75,866,000
Intangible Assets, Accumulated Amortization	(60,934,000)		(57,886,000)
Intangible Assets, Net	14,746,000		17,980,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012 (remainder)	3,082,000
2013	4,846,000
2014	3,374,000
2015	2,033,000
2016	1,267,000
2017	136,000
Thereafter	8,000
Total	14,746,000
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	7,162,000		7,246,000
Intangible Assets, Accumulated Amortization	(7,137,000)		(7,220,000)
Intangible Assets, Net	25,000		26,000
Customer lists
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	9,852,000		9,807,000
Intangible Assets, Accumulated Amortization	(5,652,000)		(5,142,000)
Intangible Assets, Net	4,200,000		4,665,000
Trade name
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	3,553,000		3,566,000
Intangible Assets, Accumulated Amortization	(2,692,000)		(2,504,000)
Intangible Assets, Net	861,000		1,062,000
Non-compete agreements
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	837,000		837,000
Intangible Assets, Accumulated Amortization	(778,000)		(784,000)
Intangible Assets, Net	59,000		53,000
Production know-how
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	910,000		910,000
Intangible Assets, Accumulated Amortization	(713,000)		(621,000)
Intangible Assets, Net	197,000		289,000
Existing technology and Production know-how
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	2,300,000	3,000,000
Existing technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	52,301,000		52,283,000
Intangible Assets, Accumulated Amortization	(43,962,000)		(41,615,000)
Intangible Assets, Net	8,339,000		10,668,000
In-process research and development
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	1,065,000		1,217,000
Intangible Assets, Accumulated Amortization	0		0
Intangible Assets, Net	$ 1,065,000		$ 1,217,000