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Basis of Presentation - Additional Information (Detail)	9 Months Ended
	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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Amount of cumulative tax effect on beginning retained earnings from change in accounting principle.

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-SubTopic 20
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