FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets (Details) - Fair value, measurements, recurring $ in Thousands	6 Months Ended
	Sep. 30, 2015 USD ($)
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ (4,484)
Increase in fair value and accretion expense (included within research and development expense)	(76)
Balance at end of period	(4,560)
Contingently Returnable Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0
Contingently returnable consideration	19,125
Balance at end of period	$ 19,125