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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2023
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Fair Value Disclosures [Abstract] |  |  |
Long-term debt and finance leases, including current maturities, carrying value | $ 131,678 | $ 315,210 | $ 538,300
Long-term debt and finance leases, including current maturities, fair value | $ 124,600 | $ 305,300 | $ 493,600

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