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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt and Finance Leases, Including Current Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2023
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

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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