STOCK PLANS - Summary of Transactions under 1999 Stock Option Plan and 2007 Equity Incentive Plan (Details) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Stock Options, Number of Shares
Beginning outstanding balance (in shares)	0	0	31,350
Granted (in shares)	0	0	0
Exercised (Options)/Issued (RSU’s) (in shares)	0	0	(23,850)
Canceled (in shares)	0	0	(7,500)
Ending outstanding balance (in shares)	0	0	0
Stock Options, Weighted Average Exercise Price
Beginning outstanding balance (in dollars per share)	$ 0.00	$ 0.00	$ 5.87
Granted (in dollars per share)	0.00	0.00	0.00
Exercised (Options)/Issued (RSU’s) (in dollars per share)	0.00	0.00	5.87
Canceled (in dollars per share)	0.00	0.00	5.87
Ending outstanding balance (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Restricted Stock Units, Number of Awards
Beginning outstanding balance (in shares)	2,873,306	1,929,315	1,738,299
Granted (in shares)	2,020,536	1,806,490	1,009,770
Exercised (Options)/Issued (RSU’s) (in shares)	(950,159)	(736,170)	(728,239)
Canceled (in shares)	(333,382)	(126,329)	(90,515)
Ending outstanding balance (in shares)	3,610,301	2,873,306	1,929,315
Restricted Stock Units, Weighted Average Fair Value
Beginning outstanding balance (in dollars per share)	$ 35.32	$ 30.18	$ 21.11
Granted (in dollars per share)	24.92	37.20	36.92
Exercised (Options)/Issued (RSU’s) (in dollars per share)	33.16	26.52	18.97
Canceled (in dollars per share)	33.40	34.99	21.44
Ending outstanding balance (in dollars per share)	$ 30.24	$ 35.32	$ 30.18