Segment and Enterprise Wide Disclosures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Number of business segments	1
Goodwill	$ 37,990	$ 35,410	$ 36,846
United States
Segment Reporting Information [Line Items]
Percentage of total consolidated assets	74.00%	71.00%
Europe
Segment Reporting Information [Line Items]
Goodwill	$ 38,000	$ 35,400
Percentage of total consolidated assets, excluding goodwill	8.00%	8.00%
International
Segment Reporting Information [Line Items]
Percentage of total product revenue	9.00%	7.00%	8.00%