INTANGIBLE ASSETS AND GOODWILL (Schedule of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Intangible Assets Excluding Goodwill [Line Items]
Gross Amount	$ 290,390	$ 290,390
Accumulated Amortization	(279,801)	(277,577)
Net Amount	10,589	12,813
Purchased technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross Amount	180,613	180,613
Accumulated Amortization	(178,536)	(178,168)
Net Amount	2,077	2,445
Trademarks [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross Amount	3,900	3,900
Accumulated Amortization	(3,900)	(3,900)
Net Amount
Customer lists [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross Amount	105,719	105,719
Accumulated Amortization	(97,365)	(95,509)
Net Amount	8,354	10,210
In-process research and development [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross Amount	158	158
Accumulated Amortization
Net Amount	$ 158	$ 158