Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $)	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Oct. 01, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 1,600,000	$ 2,100,000
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	75,185,000		75,866,000
Intangible Assets, Accumulated Amortization	(58,780,000)		(57,886,000)
Intangible Assets, Net	16,405,000		17,980,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012 (remainder)	4,710,000
2013	4,857,000
2014	3,373,000
2015	2,044,000
2016	1,257,000
2017	154,000
Thereafter	10,000
Total	16,405,000
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	6,982,000		7,246,000
Intangible Assets, Accumulated Amortization	(6,956,000)		(7,220,000)
Intangible Assets, Net	26,000		26,000
Customer lists
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	9,748,000		9,807,000
Intangible Assets, Accumulated Amortization	(5,248,000)		(5,142,000)
Intangible Assets, Net	4,500,000		4,665,000
Trade name
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	3,483,000		3,566,000
Intangible Assets, Accumulated Amortization	(2,539,000)		(2,504,000)
Intangible Assets, Net	944,000		1,062,000
Non-compete agreements
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	831,000		837,000
Intangible Assets, Accumulated Amortization	(764,000)		(784,000)
Intangible Assets, Net	67,000		53,000
Production know-how
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	910,000		910,000
Intangible Assets, Accumulated Amortization	(627,000)		(621,000)
Intangible Assets, Net	283,000		289,000
Existing technology and Production know-how
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	1,200,000	1,400,000
Existing technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	52,011,000		52,283,000
Intangible Assets, Accumulated Amortization	(42,646,000)		(41,615,000)
Intangible Assets, Net	9,365,000		10,668,000
In-process research and development
Finite-Lived Intangible Assets, Net [Abstract]
Intangible Assets, Gross Carrying Amount	1,220,000		1,217,000
Intangible Assets, Accumulated Amortization	0		0
Intangible Assets, Net	$ 1,220,000		$ 1,217,000