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Retirement Benefit Plans - Narrative (Details) - USD ($) |  | 9 Months Ended
--- | --- | ---
Nov. 26, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions amount in defined benefit pension plans |  | $ 604,000 | $ 48,000
Additional cash contributions planned for fiscal 2020 |  | 0 |
Other debt withdrawal liability |  | $ 739,000 |
IAM National Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Payment period | 20 years |  |

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