FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level 3 Financial Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
(Increase) / decrease in fair value and accretion expense (included within research and development expense)		$ (9)
Contingently returnable consideration	$ 16,131
Payments received	(9,306)	0	$ 0
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(4,484)	(4,291)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	(152)	(193)
Contingently returnable consideration	0
Increase in fair value	(21)
Gross presentation of contingently returnable consideration to contingent purchase consideration	(2,636)
Payments received	0
Ending balance	(7,293)	(4,484)	(4,291)
Fair value, measurements, recurring | Contingently Returnable Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	0
Contingently returnable consideration	19,125
Increase in fair value	3,676
Gross presentation of contingently returnable consideration to contingent purchase consideration	2,636
Payments received	(9,306)
Ending balance	16,131	0
Fair value, measurements, recurring | Contingent Contractual Non-compliance Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	(49)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)		49
Ending balance		$ 0	$ (49)