Restructuring and Related Costs (Summary of Restructuring Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 563	$ 1,491
2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	563
Machida, Japan [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	563
Machida, Japan [Member] | Cost of sales | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	326
Machida, Japan [Member] | Cost of sales | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | Cost of sales | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	326
Machida, Japan [Member] | Selling and Marketing Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	81
Machida, Japan [Member] | Selling and Marketing Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | Selling and Marketing Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	81
Machida, Japan [Member] | General and Administrative Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	156
Machida, Japan [Member] | General and Administrative Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | General and Administrative Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	156
Machida, Japan [Member] | Research and Development Expense [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | Research and Development Expense [Member] | Test [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Machida, Japan [Member] | Research and Development Expense [Member] | Sensors [Member] | 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0