Segment and Enterprise Wide Disclosures - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | Segment			1
Goodwill	$ 32,676		$ 32,676		$ 31,534
United States
Segment Reporting Information [Line Items]
Percentage of total consolidated assets	77.00%		77.00%		77.00%
Europe
Segment Reporting Information [Line Items]
Goodwill	$ 47,900		$ 47,900		$ 46,200
International
Segment Reporting Information [Line Items]
Percentage of total consolidated assets, excluding goodwill	10.00%		10.00%		10.00%
Percentage of total product revenue	7.00%	11.00%	7.00%	11.00%