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Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 164,899 $ 100,780
Current maturities of long-term debt, carrying Amount 80,500 9,000
Long-term debt 84,399 91,780
Long-term debt, fair value [1] 165,500 101,500
Current maturities of long-term debt, fair value [1] 80,500 9,000
Long-term portion of debt, fair value [1] 85,000 92,500
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility borrowings, carrying Amount 70,500 1,500
Credit facility borrowings, fair value [1] 70,500 1,500
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [2] 94,399 99,280
Long-term debt, fair value [1],[2] $ 95,000 $ 100,000
[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 $0.6 million as of June 30, 2019 and $0.7 million as of September 30, 2018.