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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Parenthetical) (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |  |
Long term debt |  | $ 225,895 |  | $ 184,360
Loan repayment |  | 8,250 | $ 11,365 |
Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance costs |  | 800 |  | 900
Long term debt | [1] | $ 155,959 |  | $ 164,084
[1] | Carrying amounts are net of unamortized debt issuance costs of $0.8 million as of March 31, 2023 and $0.9 million as of September 30, 2022

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