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Current and Deferred Income Tax Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Deferred Income Tax Assets And Liabilities        
Income (loss) before income taxes $ (4,993) $ (13,970) $ 110,595 $ 142,819
Current tax expense (benefit) (6,759) (6,433) 33,268 51,339
Deferred tax expense 5,004 822 13,298 8,598
Total tax expense (benefit) $ (1,755) $ (5,611) $ 46,566 $ 59,937