FAIR VALUE MEASUREMENTS - Reconciliation of Changes in Fair Value of Level Three Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payments	$ 841	$ 2,356
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	(5,087)
Change in fair value (included within research and development expense)	107
Payments	841
Balance at end of period	(4,139)
Fair value, measurements, recurring | Contingent Contractual Non-compliance Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	(246)
Change in fair value (included within research and development expense)	98
Payments	0
Balance at end of period	$ (148)