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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 125,975 $ 153,447
Current maturities of long-term debt, carrying Amount 13,000 33,000
Long-term debt 112,975 120,447
Long-term debt, fair value [1] 126,750 154,000
Current maturities of long-term debt, fair value [1] 13,000 33,000
Long-term portion of debt, fair value [1] 113,750 121,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility borrowings, carrying Amount 0 61,500
Credit facility borrowings, fair value [1] 0 61,500
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [2] 125,975 91,947
Long-term debt, fair value [1],[2] $ 126,750 $ 92,500
[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 $0.8 million as of June 30, 2020 and $0.6 million as of September 30, 2019.