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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 152,092 $ 184,360
Current maturities of long-term debt, carrying Amount 16,698 32,651
Long-term debt [1] 135,394 151,709
Long-term debt, fair value [2] 152,823 185,276
Current maturities of long-term debt, fair value [2] 16,698 32,651
Long-term portion of debt, fair value [1],[2] 136,125 152,625
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility borrowings, carrying Amount 198 20,276
Credit facility borrowings, fair value [2] 198 20,276
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [1] 151,894 164,084
Long-term debt, fair value [1],[2] $ 152,625 $ 165,000
[1] Carrying amounts are net of unamortized debt issuance costs of $0.7 million as of June 30, 2023 and $0.9 million as of September 30, 2022
[2] The face amount of the Company’s variable rate long-term debt approximates fair value.