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Current and Deferred Income Tax Expenses (Benefits) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Deferred Income Tax Assets And Liabilities        
Income (loss) before income taxes $ (21,766) $ (4,993) $ 76,368 $ 110,595
Current tax expense (benefit) (5,764) (6,759) 27,270 33,268
Deferred tax expense (benefit) (2,670) 5,004 4,451 13,298
Total tax expense (benefit) $ (8,434) $ (1,755) $ 31,721 $ 46,566