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Pension Plans - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | $ 2,677,290 | $ 2,296,034
Ending balance | 3,214,398 | 2,677,290
Pension Plan |  |
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | 9,573 | 5,408
Recognized during year - net actuarial losses | (398) | (241)
Occurring during year - settlement gain | 19 | 0
Occurring during year - net actuarial losses (gains) | 5,369 | 3,871
Plan amendments | 0 | 91
Foreign exchange impact | 667 | 444
Ending balance | $ 15,230 | $ 9,573

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