Segment information, Revenues from Electronic Controls Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Revenue from External Customer [Line Items]
Revenue from external customer	$ 13,913	$ 10,346	$ 36,209	$ 30,619
Reportable Segments [Member] | Controls [Member]
Revenue from External Customer [Line Items]
Revenue from external customer	8,462	9,820	25,968	29,000
Reportable Segments [Member] | Controls [Member] | Electronic Controls for Zero Emission and Hybrid Electric Vehicles [Member]
Revenue from External Customer [Line Items]
Revenue from external customer	5,638	7,445	17,876	19,746
Reportable Segments [Member] | Controls [Member] | Accessory and Aftermarket Products and Services and Engineering Contracts [Member]
Revenue from External Customer [Line Items]
Revenue from external customer	$ 2,824	$ 2,375	$ 8,092	$ 9,254