FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gross presentation of contingently returnable consideration to contingent purchase consideration	$ 0	$ 3,676
Collection of contingently returnable consideration	12,864	$ 8,750
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at March 31, 2016	(7,293)
Additions to Level 3	(660)
Increase in fair value and accretion expense (included within research and development expense)	(114)
Gross presentation of contingently returnable consideration to contingent purchase consideration	(3,910)
Payments made	6,567
Balance at December 31, 2016	(5,410)
Fair value, measurements, recurring | Contingently Returnable Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at March 31, 2016	16,131
Decrease in fair value	(610)
Gross presentation of contingently returnable consideration to contingent purchase consideration	3,910
Collection of contingently returnable consideration	(19,431)
Balance at December 31, 2016	$ 0