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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
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Term Loan |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 0.5 | $ 0.7

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