FAIR VALUE MEASUREMENTS - Reconciliation of Changes in Fair Value of Level Three Financial Assets (Detail) (Fair value, measurements, recurring, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ (4,291)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	(116)
Balance at end of period	(4,407)
Contingent Contractual Non-compliance Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	(49)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	49
Balance at end of period	$ 0