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Partnership's Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 97,500 $ 100,000
Current maturities of long-term debt, carrying Amount 10,000 10,000
Long-term portion of debt, Carrying Amount 87,500 90,000
Long-term debt, fair value [1] 97,500 100,000
Current maturities of long-term debt, fair value [1] 10,000 10,000
Long-term portion of debt, fair value [1] 87,500 90,000
$100 million Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount 97,500 100,000
Long-term debt, fair value [1] $ 97,500 $ 100,000
[1] The face amount of the Partnership's variable rate long-term debt approximates fair value.