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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Income Tax [Line Items] |  |
Effective tax rate | 31.00% | 33.00%
ASU 2016-09 [Member] |  |
Income Tax [Line Items] |  |
Recognition of excess tax benefits in provision for income taxes | $ 2.7 |

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