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Basis of Presentation - Additional Information (Detail) | 9 Months Ended
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Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |
Increase in gross profit | $ 300,000
Decrease in other income | (300,000)
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 | $ 2,500,000

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