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Retirement Benefit Plans - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2024 USD ($) plan | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of defined benefit pension plans | plan |  | 3 |  |
Increase in benefit obligation |  | $ 542,000 |  |
Benefit obligation |  | 20,888,000 | $ 20,345,000 | $ 22,492,000
Employer contributions |  | $ 275,000 |  |
Other debt withdrawal liability | $ 739,000 |  |  |
Employer matching contribution percentage of employees' gross pay |  | 100.00% |  |
Percentage of eligible compensation of deferral contribution, minimum |  | 1.00% |  |
Percentage of eligible compensation |  | 80.00% |  |
Percentage of eligible compensation of deferral contribution, maximum |  | 6.00% |  |
Matching contribution expense for defined contribution plan |  | $ 550,000 | 516,000 |
Number of company sponsored defined benefit pension plans | plan |  | 2 |  |
Non-elective contribution expense |  | $ 228,000 | $ 222,000 |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-elective contribution (in dollars per hour of work) |  | 1.50 |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-elective contribution (in dollars per hour of work) |  | $ 1.25 |  |
IAM National Pension Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment period | 20 years |  |  |

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