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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Current:      
Federal $ 19,576 $ 50,631 $ 23,646
State 1,055 2,900 (5,381)
Foreign 8,486 7,597 10,405
Current income tax 29,117 61,128 28,670
Deferred:      
Federal (5,027) (23,592) (5,004)
State (296) (225) 1,422
Foreign (726) (2,190) (2,352)
Deferred income taxes (6,049) (26,007) (5,934)
Total provision $ 23,068 $ 35,121 $ 22,736