GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Cost	$ 79,680	$ 79,289
Accumulated Amortization	(49,465)	(47,709)
Net	30,215	31,580
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	31,005	30,865
Accumulated Amortization	(26,150)	(25,561)
Net	4,855	5,304
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	38,538	38,498
Accumulated Amortization	(17,691)	(16,935)
Net	20,847	21,563
Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,640	1,585
Accumulated Amortization	(804)	(711)
Net	836	874
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,177	7,118
Accumulated Amortization	(3,930)	(3,660)
Net	3,247	3,458
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	289	280
Accumulated Amortization	(289)	(280)
Net	0	0
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,031	943
Accumulated Amortization	(601)	(562)
Net	$ 430	$ 381