SEGMENT AND GEOGRAPHIC INFORMATION - Total Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 92,097	$ 84,545	$ 173,902	$ 160,906
United States
Segment Reporting Information [Line Items]
Total revenue	66,853	66,616	129,625	121,711
Europe
Segment Reporting Information [Line Items]
Total revenue	12,654	8,001	21,593	18,433
Asia
Segment Reporting Information [Line Items]
Total revenue	6,850	4,206	10,753	8,477
Rest of the world
Segment Reporting Information [Line Items]
Total revenue	$ 5,740	$ 5,722	$ 11,931	$ 12,285