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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Parenthetical) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
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Term Loan |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 0.4 | $ 0.5

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