Restructuring and Related Costs (Narrative) (Details)	3 Months Ended			9 Months Ended
	Jul. 01, 2017 USD ($)	Oct. 01, 2016 employee	Jul. 02, 2016 USD ($) position	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 1,036,000
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			61
Restructuring charges	$ 0		$ 1,237,000	0	$ 1,237,000
2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		$ 0	0	$ 0
Machida, Japan | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee		35
Restructuring charges	92,000			1,036,000
Restructuring and Related Cost, Cost Incurred to Date	1,964,000			1,964,000
Employee severance | Machida, Japan | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1,444,000			1,444,000
Facility Closing [Member] | Machida, Japan | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 520,000			$ 520,000