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Basis of Presentation - Additional Information (Detail) | 6 Months Ended
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Sep. 30, 2017 USD ($)
Significant Accounting Policies [Line Items] |
Increase in gross profit | $ 400,000
Decrease in other income | (400,000)
ASU 2016-09 [Member] |
Significant Accounting Policies [Line Items] |
Cumulative effect reduction in retained earnings | (700,000)
Impact to retained earnings | 0
Recognition of excess tax benefits in provision for income taxes | $ 2,700,000

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