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Description of Business and Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Oct. 02, 2021 USD ($) numberOfEmployees | Oct. 03, 2020 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2019 USD ($) | Sep. 30, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings | $ 1,433,991 | $ 1,295,079 |  |  |
Entity Number of Employees | numberOfEmployees | 19,200,000 |  |  |  |
Exchange gains (losses) on foreign currency transactions | $ (1,100) | (400) | $ 500 |  |
Forward currency exchange contracts treated as cash flow hedges and recorded in accumulated other comprehensive loss | (2,200) | 1,800 | $ 1,100 |  |
Fair value of debt | 217,100 | 299,300 |  |  |
Carrying value of debt | $ 205,000 | $ 288,000 |  |  |
ASU 2016-02 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings |  |  |  | $ (1,100) |
Engineering Design and Development Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percentage of consolidated net sales (less than) | 5.00% | 5.00% | 5.00% |  |
Adjustments due to the adoption of ASU 2014-09 | ASU 2014-09 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ 7,800

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