GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 80,989	$ 79,724
Accumulated Amortization	(39,762)	(34,497)
Net	41,227	45,227
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	31,603	30,848
Accumulated Amortization	(22,964)	(21,343)
Net	8,639	9,505
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	38,789	38,718
Accumulated Amortization	(13,294)	(11,038)
Net	25,495	27,680
Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,996	1,895
Accumulated Amortization	(480)	(219)
Net	1,516	1,676
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,553	7,446
Accumulated Amortization	(2,389)	(1,455)
Net	5,164	5,991
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	352	334
Accumulated Amortization	(264)	(167)
Net	88	167
Other
Finite-Lived Intangible Assets [Line Items]
Cost	696	483
Accumulated Amortization	(371)	(275)
Net	$ 325	$ 208