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Description of Business and Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Disaggregation of Revenue [Line Items] |  |  |
Exchange gains (losses) on foreign currency transactions | $ 2,300,000 | $ (1,700,000) | $ 1,300,000
Forward currency exchange contracts treated as cash flow hedges and recorded in accumulated other comprehensive loss | 2,405,000 | 8,967,000 | $ (11,223,000)
Fair value of debt | 284,500,000 | 251,400,000 |
Carrying value of debt | 283,000,000 | $ 250,000,000 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net impact to fiscal 2017 opening retained earnings balance | $ 0 |  |
Engineering Design and Development Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of consolidated net sales (less than) | 5.00% | 5.00% | 5.00%
Accounting Standards Update 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net operating loss carryforward related to tax deductions in excess of compensation expense for stock options |  | $ 4,900,000 |
Increase to valuation allowance |  | 4,900,000 |
Accounting Standards Update 2016-09 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net impact to fiscal 2017 opening retained earnings balance |  | $ 0 |

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