Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($) $ in Thousands		Jun. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Long-term debt, carrying Amount		$ 225,024	$ 118,624
Current maturities of long-term debt, carrying Amount	[1]	71,895	26,239
Long-term debt	[1],[2],[3]	153,129	92,385
Long-term debt, fair value	[4]	225,395	119,118
Current maturities of long-term debt, fair value	[1],[4]	71,895	26,239
Long-term portion of debt, fair value	[1],[2],[4]	153,500	92,879
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowings, carrying Amount		129,510	8,618
Long-term debt, carrying Amount		69,100
Credit facility borrowings, fair value	[4]	129,510	8,618
Term Loan
Debt Instrument [Line Items]
Long-term debt, carrying Amount	[2]	95,514	110,006
Long-term debt, fair value	[2],[4]	$ 95,885	$ 110,500

[1] On July 6, 2022, the Company refinanced its five-year term loan and the revolving credit facility with the execution of the sixth amended and restated revolving credit facility agreement. (See Note 16—Subsequent Events). As of June 30, 2022, the Company has classified $69.1 million of its revolving credit facility borrowings as long term debt. Proceeds from the new term loan were used to repay the outstanding balance of the existing term loan ($95.9 million) and $69.1 million of the revolving credit facility borrowings.

[2] Carrying amounts are net of unamortized debt issuance costs of $0.4 million as of June 30, 2022 and $0.5 million as of September 30, 2021

[3] See Note 16 - Subsequent Events.

[4] The face amount of the Company’s variable rate long-term debt approximates fair value.