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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 188,118 $ 208,816
Current maturities of long-term debt, carrying Amount 21,000 21,005
Long-term debt 167,118 187,811
Long-term debt, fair value [1] 189,000 210,005
Current maturities of long-term debt, fair value [1] 21,000 21,005
Long-term portion of debt, fair value [1] 168,000 189,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility borrowings, carrying Amount 0 5
Credit facility borrowings, fair value [1] 0 5
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [2] 188,118 208,811
Long-term debt, fair value [1],[2] $ 189,000 $ 210,000
[1] The face amount of the Company’s variable rate long-term debt approximates fair value.
[2] Carrying amounts are net of unamortized debt issuance costs of $0.9 million as of September 30, 2025 and $1.2 million as of September 30, 2024.