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Pension Plans - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | $ 2,296,034 | $ 2,038,468
Ending balance | 2,677,290 | 2,296,034
Pension Plan |  |
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | 5,408 | 30,213
Recognized during year - net actuarial losses | (241) | (1,421)
Occurring during year - settlement gain | 0 | 82
Occurring during year - net actuarial losses | 3,871 | (21,253)
Plan amendments | 91 | 0
Foreign exchange impact | 444 | (2,213)
Ending balance | $ 9,573 | $ 5,408

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