Restructuring And Related Costs (Narrative) (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Oct. 01, 2016 USD ($) employee	Jul. 02, 2016 USD ($) employee	Jul. 01, 2017 USD ($)	Oct. 01, 2016 USD ($)	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense				$ 2,165,000	$ 0
Total severance and related costs						$ 6,336,000
2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee		61
Restructuring expense		$ 1,237,000		$ 2,165,000
2016 Restructuring Plan [Member] | Machida, Japan [Member]
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee	35
Restructuring expense	$ 408,000
2016 Restructuring Plan [Member] | Machida, Japan [Member] | Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 1,200,000
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 520,000