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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Long-term debt, including current maturities, carrying value	$ 670,335	$ 743,250
Long-term debt, including current maturities, fair value	$ 676,800	$ 768,700

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.

+ References

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X

- Definition

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

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