FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Collection of contingently returnable consideration	$ 5,133	$ 0
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	(7,293)
Additions to Level 3	(660)
Increase in fair value and accretion expense (included within research and development expense)	(76)
Gross presentation of contingently returnable consideration to contingent purchase consideration	(3,910)
Payments made	2,657
Balance at end of period	(9,282)
Fair value, measurements, recurring | Contingently Returnable Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	16,131
Decrease in fair value	(608)
Gross presentation of contingently returnable consideration to contingent purchase consideration	3,910
Collection of contingently returnable consideration	(7,790)
Balance at end of period	$ 11,643