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Partnership's Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 80,567 $ 91,641
Current maturities of long-term debt, carrying Amount 10,000 16,200
Long-term portion of debt, Carrying Amount 70,567 75,441
Long-term debt, fair value [1] 81,300 92,500
Current maturities of long-term debt, fair value [1] 10,000 16,200
Long-term portion of debt, fair value [1] 71,300 76,300
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [2] 80,567 91,641
Long-term debt, fair value [1],[2] $ 81,300 $ 92,500
[1] The face amount of the Partnership's variable rate long-term debt approximates fair value.
[2] Carrying amounts are net of unamortized debt issuance costs of $0.7 million as of March 31, 2017, and $0.9 million as of September 30, 2016.