GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 80,772	$ 81,457
Accumulated Amortization	(44,907)	(41,544)
Net	35,865	39,913
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	31,588	31,946
Accumulated Amortization	(24,670)	(23,524)
Net	6,918	8,422
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	38,701	38,801
Accumulated Amortization	(15,513)	(14,046)
Net	23,188	24,755
Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,872	2,014
Accumulated Amortization	(684)	(568)
Net	1,188	1,446
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,421	7,572
Accumulated Amortization	(3,224)	(2,701)
Net	4,197	4,871
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	329	355
Accumulated Amortization	(329)	(295)
Net	0	60
Other
Finite-Lived Intangible Assets [Line Items]
Cost	861	769
Accumulated Amortization	(487)	(410)
Net	$ 374	$ 359