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Description of Business and Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Exchange gains (losses) on foreign currency transactions	$ 1,200	$ 2,300	$ (1,700)
Forward currency exchange contracts treated as cash flow hedges and recorded in accumulated other comprehensive loss	(3,942)	2,405	$ 8,967
Fair value of debt	151,900	284,500
Carrying value of debt	$ 150,000	$ 283,000
Minimum | Retained Earnings | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 5,000
Maximum | Retained Earnings | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				15,000
Finished good and work in progress inventories | Minimum | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				45,000
Finished good and work in progress inventories | Maximum | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				70,000
Unbilled receivable | Minimum | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				55,000
Unbilled receivable | Maximum | Subsequent Event | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 80,000
Engineering Design and Development Services
Disaggregation of Revenue [Line Items]
Percentage of consolidated net sales (less than)	5.00%	5.00%	5.00%

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