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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Current: |  |  |
Federal | $ 8,071 | $ 19,576 | $ 50,631
State | 2,236 | 1,055 | 2,900
Foreign | 9,559 | 8,486 | 7,597
Current income tax | 19,866 | 29,117 | 61,128
Deferred: |  |  |
Federal | 28,013 | (5,027) | (23,592)
State | 132 | (296) | (225)
Foreign | (2,416) | (726) | (2,190)
Deferred income taxes | 25,729 | (6,049) | (26,007)
Total provision | $ 45,595 | $ 23,068 | $ 35,121

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