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Pension Plans - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | $ 3,214,398 | $ 2,677,290
Ending balance | 3,826,229 | 3,214,398
Pension Plan |  |
AOCI Attributable to Parent, Before Tax [Roll Forward] |  |
Beginning balance | 15,230 | 9,573
Recognized during year - amortization of net actuarial losses | (697) | (398)
Occurring during year - effect of settlement | 65 | 19
Occurring during year - net actuarial losses (gains) | (1,681) | 5,369
Foreign exchange impact | 703 | 667
Ending balance | $ 13,620 | $ 15,230

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- Definition Other comprehensive income loss pension and other postretirement benefit plans settlement gain loss occurring during period before tax. + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Foreign Currency Translation Gain (Loss) Arising During Period, Net of Tax + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Occurring During Period, Before Tax + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Recognized During Period, Before Tax + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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