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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | $ 36,063 | $ 36,439 | $ 40,690 | $ 46,968 | $ 49,748 | $ 49,622
Foreign currency translation adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | (5,760) |  | (6,196) |  |  |
Retirement plan liability adjustment, net of tax |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | (2,204) |  | (2,509) |  |  |
Interest rate swap agreement, net of tax |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | 13 |  | 12 |  |  |
Total accumulated other comprehensive loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | $ (7,951) | $ (8,124) | $ (8,693) | $ (9,216) | $ (9,100) | $ (9,079)

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