XML 50 R39.htm IDEA: XBRL DOCUMENT v3.7.0.1
Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Net Assets (Liabilities) Presented in the Statement of Financial Position   $ 3,987
Net Assets (Liabilities) Presented in the Statement of Financial Position $ (1,754) (2,285)
Subject to an enforceable master netting arrangement    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 6,642 13,061
Gross Liabilities Offset in the Statement of Financial Position (8,432) (10,555)
Net Assets (Liabilities) Presented in the Statement of Financial Position (1,790) 2,506
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (1,790) 2,506
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 5,877 3,976
Gross Liabilities Offset in the Statement of Financial Position (7,631) (6,261)
Net Assets (Liabilities) Presented in the Statement of Financial Position (1,754) (2,285)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (1,754) (2,285)
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 Assets Recognized 605 481
Gross Liabilities Offset in the Statement of Financial Position (669) (484)
Net Assets (Liabilities) Presented in the Statement of Financial Position (64) (3)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (64) (3)
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   7,716
Gross Liabilities Offset in the Statement of Financial Position   (3,729)
Net Assets (Liabilities) Presented in the Statement of Financial Position   3,987
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount   3,987
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 160 888
Gross Liabilities Offset in the Statement of Financial Position (132) (81)
Net Assets (Liabilities) Presented in the Statement of Financial Position 28 807
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount $ 28 $ 807