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Partnership's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - Commodity Contract - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts $ 13,061 $ 31,603
Derivative Liabilities, commodity contracts (10,555) (44,489)
Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 11,692 26,628
Other long-term liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 1,369 4,975
Derivative Liabilities, commodity contracts (565) (5,977)
Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts (9,990) (41,270)
Cash Collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts   2,758
Quoted Prices in Active Markets for Identical Assets Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 481 2,947
Derivative Liabilities, commodity contracts (2,087) 720
Quoted Prices in Active Markets for Identical Assets Level 1 | Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts   930
Quoted Prices in Active Markets for Identical Assets Level 1 | Other long-term liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 481 2,017
Derivative Liabilities, commodity contracts (484) (2,038)
Quoted Prices in Active Markets for Identical Assets Level 1 | Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts (1,603)  
Quoted Prices in Active Markets for Identical Assets Level 1 | Cash Collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts   2,758
Significant Other Observable Inputs Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 12,580 28,656
Derivative Liabilities, commodity contracts (8,468) (45,209)
Significant Other Observable Inputs Level 2 | Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 11,692 25,698
Significant Other Observable Inputs Level 2 | Other long-term liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 888 2,958
Derivative Liabilities, commodity contracts (81) (3,939)
Significant Other Observable Inputs Level 2 | Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts $ (8,387) $ (41,270)