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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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