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Pension Plans - Components of Net Periodic Pension Cost (Details) - Pension Plan - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost of projected benefit obligation | $ 2,121 | $ 2,368 | $ 2,126
Service cost | 578 | 674 | 690
Expected return on plan assets | (3,700) | (3,361) | (3,541)
Amortization of prior service cost | 0 | 0 | 0
Recognized actuarial loss | 697 | 398 | 241
Settlement gain | (65) | (19) | 0
Net periodic pension (benefit) cost | $ (369) | $ 60 | $ (484)

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