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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
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 $ 19,220 $ 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 19,975 8,725
Gross Liabilities Offset in the Statement of Financial Position (6) (2,817)
Net Assets (Liabilities) Presented in the Statement of Financial Position 19,969 5,908
Financial Instruments   0
Cash Collateral Received   0
Net Amount 19,969 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 19,220 6,023
Gross Liabilities Offset in the Statement of Financial Position   (91)
Net Assets (Liabilities) Presented in the Statement of Financial Position 19,220 5,932
Financial Instruments   0
Cash Collateral Received   0
Net Amount 19,220 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 755  
Gross Liabilities Offset in the Statement of Financial Position (6)  
Net Assets (Liabilities) Presented in the Statement of Financial Position 749  
Net Amount $ 749  
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   (1)
Net Assets (Liabilities) Presented in the Statement of Financial Position   (1)
Financial Instruments   0
Cash Collateral Received   0
Net Amount   $ (1)