Restructuring (Summary of Restructuring Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 02, 2016	Jul. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 1,237
2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,237	1,237
Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	847	847
Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	390	390
Cost of Sales [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	299	299
Cost of Sales [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	299	299
Cost of Sales [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	0
Selling and Marketing Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	227	227
Selling and Marketing Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	129	129
Selling and Marketing Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	98	98
General and Administrative Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	706	706
General and Administrative Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	414	414
General and Administrative Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	292	292
Research and Development Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5	5
Research and Development Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5	5
Research and Development Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 0