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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Amortized Costs	$ 167,085	$ 163,005
Gross Unrealized Gains	189	89
Gross Unrealized Loss	(201)	(244)
Estimated Fair Value	167,073	162,850
Cash and cash equivalents	27,466	33,576	$ 29,298	$ 53,110
Short-term marketable investments	139,607	129,274
Liabilities, Fair Value Disclosure	216	341		$ 0
Aavailable-for-sale investments due within one year	79,772
Aavailable-for-sale investments due after one year	59,835
Level 1
Amortized Costs	29,466	35,576
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(175)	(187)
Estimated Fair Value	29,291	35,389
Cash and cash equivalents	27,466	33,576
Short-term marketable investments	1,825	1,813
Level 2
Amortized Costs	137,619	127,429
Gross Unrealized Gains	189	89
Gross Unrealized Loss	(26)	(57)
Estimated Fair Value	137,782	127,461
Cash and cash equivalents	0	0
Short-term marketable investments	137,782	127,461
Level 3
Amortized Costs	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	216	341
Cash and cash equivalents	0	0
Short-term marketable investments	0	0
Liabilities, Fair Value Disclosure	216	341
Cash
Amortized Costs	22,440	18,596
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	22,440	18,596
Cash and cash equivalents	22,440	18,596
Short-term marketable investments	0	0
Money Market Funds | Level 1
Amortized Costs	5,026	14,980
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	5,026	14,980
Cash and cash equivalents	5,026	14,980
Short-term marketable investments	0	0
Mutual Funds | Level 1
Amortized Costs	2,000	2,000
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(175)	(187)
Estimated Fair Value	1,825	1,813
Cash and cash equivalents	0	0
Short-term marketable investments	1,825	1,813
Commercial Paper | Level 2
Amortized Costs	15,660	6,794
Gross Unrealized Gains	8	2
Gross Unrealized Loss	0	0
Estimated Fair Value	15,668	6,796
Cash and cash equivalents	0	0
Short-term marketable investments	15,668	6,796
Corporate Debt | Level 2
Amortized Costs	88,620	85,164
Gross Unrealized Gains	143	78
Gross Unrealized Loss	(10)	(28)
Estimated Fair Value	88,753	85,214
Cash and cash equivalents	0	0
Short-term marketable investments	88,753	85,214
Municipal Securities | Level 2
Amortized Costs	1,001	1,007
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(1)	(1)
Estimated Fair Value	1,000	1,006
Cash and cash equivalents	0	0
Short-term marketable investments	1,000	1,006
Asset-backed Securities | Level 2
Amortized Costs	27,349	24,614
Gross Unrealized Gains	32	7
Gross Unrealized Loss	(1)	(11)
Estimated Fair Value	27,380	24,610
Cash and cash equivalents	0	0
Short-term marketable investments	27,380	24,610
Mortgage backed Securities | Level 2
Amortized Costs	1,989	2,045
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(14)	(17)
Estimated Fair Value	1,975	2,028
Cash and cash equivalents	0	0
Short-term marketable investments	1,975	2,028
Agency Bond | Level 2
Amortized Costs	2,000	6,805
Gross Unrealized Gains	5	1
Gross Unrealized Loss	0	0
Estimated Fair Value	2,005	6,806
Cash and cash equivalents	0	0
Short-term marketable investments	2,005	6,806
International Government Securities | Level 2
Amortized Costs	1,000	1,000
Gross Unrealized Gains	1	1
Gross Unrealized Loss	0	0
Estimated Fair Value	1,001	1,001
Cash and cash equivalents	0	0
Short-term marketable investments	1,001	1,001
Contingent Consideration | Level 3
Amortized Costs	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	216	341
Cash and cash equivalents	0	0
Short-term marketable investments	0	0
Liabilities, Fair Value Disclosure	$ 216	$ 341

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