GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 81,367	$ 81,457
Accumulated Amortization	(43,324)	(41,544)
Net	38,043	39,913
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	31,872	31,946
Accumulated Amortization	(24,143)	(23,524)
Net	7,729	8,422
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	38,780	38,801
Accumulated Amortization	(14,789)	(14,046)
Net	23,991	24,755
Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,984	2,014
Accumulated Amortization	(642)	(568)
Net	1,342	1,446
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,541	7,572
Accumulated Amortization	(2,980)	(2,701)
Net	4,561	4,871
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	350	355
Accumulated Amortization	(320)	(295)
Net	30	60
Other
Finite-Lived Intangible Assets [Line Items]
Cost	840	769
Accumulated Amortization	(450)	(410)
Net	$ 390	$ 359