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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Net Assets (Liabilities) Presented in the Statement of Financial Position $ 11,906 $ 5,932
Net Assets (Liabilities) Presented in the Statement of Financial Position   (289)
Subject to an enforceable master netting arrangement    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 11,994 8,725
Gross Liabilities Offset in the Statement of Financial Position (58) (2,817)
Net Assets (Liabilities) Presented in the Statement of Financial Position 11,936 5,908
Financial Instruments   0
Cash Collateral Received   0
Net Amount 11,936 5,908
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 11,959 6,023
Gross Liabilities Offset in the Statement of Financial Position (53) (91)
Net Assets (Liabilities) Presented in the Statement of Financial Position 11,906 5,932
Financial Instruments   0
Cash Collateral Received   0
Net Amount 11,906 5,932
Subject to an enforceable master netting arrangement | Deferred charges and other assets, net    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 35  
Net Assets (Liabilities) Presented in the Statement of Financial Position 35  
Net Amount 35  
Subject to an enforceable master netting arrangement | Other long-term assets, net    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized   996
Gross Liabilities Offset in the Statement of Financial Position   (730)
Net Assets (Liabilities) Presented in the Statement of Financial Position   266
Financial Instruments   0
Cash Collateral Received   0
Net Amount   266
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized   1,706
Gross Liabilities Offset in the Statement of Financial Position   (1,995)
Net Assets (Liabilities) Presented in the Statement of Financial Position   (289)
Financial Instruments   0
Cash Collateral Received   0
Net Amount   (289)
Subject to an enforceable master netting arrangement | Other long-term liabilities    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Liabilities Offset in the Statement of Financial Position (5) (1)
Net Assets (Liabilities) Presented in the Statement of Financial Position (5) (1)
Financial Instruments   0
Cash Collateral Received   0
Net Amount $ (5) $ (1)