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Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Current $ 77,682 $ 94,128 $ 73,938
Deferred (2,315) (26,887) (6,510)
Income taxes $ 75,367 $ 67,241 $ 67,428