GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 80,298	$ 79,724
Accumulated Amortization	(38,002)	(34,497)
Net	42,296	45,227
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	31,041	30,848
Accumulated Amortization	(22,416)	(21,343)
Net	8,625	9,505
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	38,772	38,718
Accumulated Amortization	(12,543)	(11,038)
Net	26,229	27,680
Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,972	1,895
Accumulated Amortization	(392)	(219)
Net	1,580	1,676
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,528	7,446
Accumulated Amortization	(2,078)	(1,455)
Net	5,450	5,991
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	348	334
Accumulated Amortization	(232)	(167)
Net	116	167
Other
Finite-Lived Intangible Assets [Line Items]
Cost	637	483
Accumulated Amortization	(341)	(275)
Net	$ 296	$ 208