Basis of Presentation (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011	Oct. 01, 2011
Inventory disclosure [Abstract]
Customer projects in various stages of completion	$ 24,369,000		$ 24,369,000		$ 19,026,000
Components, assemblies and parts	45,949,000		45,949,000		46,961,000
Total	70,318,000		70,318,000		65,987,000
Warranty obligations [Abstract]
Life of warranty obligations, minimum (in months)	12		12
Life of warranty obligations for sales, maximum (in months)	24		24
Number of previous months historical warranty claims used to calculate warranty expense percentage (in months)	12		12
Warranty provisions and claims [Roll Forward]
Beginning balance	4,595,000	6,735,000	5,290,000	7,505,000
Warranty provisions	1,094,000	1,073,000	1,483,000	1,586,000
Warranty claims	(1,565,000)	(1,482,000)	(2,583,000)	(2,930,000)
Adjustments to preexisting warranties	300,000	(100,000)	300,000	139,000
Currency translation	44,000	145,000	(22,000)	71,000
Ending balance	4,468,000	6,371,000	4,468,000	6,371,000
Software development costs [Member]
Amortization [Abstract]
Amortization expense on capitalized computer software	$ 700,000	$ 400,000	$ 1,200,000	$ 800,000