FAIR VALUE MEASUREMENTS Reconciliation of Changes in Fair Value of Level Three Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payments	$ 841	$ 4,038	$ 846
Fair value, measurements, recurring | Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at March 31, 2012		1,461
(Increase) / decrease in fair value and accretion expense (included within research and development expense)		0
ARSs redeemed by issuers at par		(1,650)
Unrealized gains included in accumulated other comprehensive income		190
Unrealized gain (loss) included in earnings		(1)
Payments		0
Balance at March 31, 2013		0
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at March 31, 2012	(5,087)	(8,213)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)		(912)
ARSs redeemed by issuers at par		0
Unrealized gains included in accumulated other comprehensive income		0
Unrealized gain (loss) included in earnings		0
Payments	841	4,038
Balance at March 31, 2013		(5,087)
Fair value, measurements, recurring | Contingent Contractual Non-compliance Liability
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at March 31, 2012	(246)	(700)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)		184
ARSs redeemed by issuers at par		0
Unrealized gains included in accumulated other comprehensive income		0
Unrealized gain (loss) included in earnings		0
Payments	0	270
Balance at March 31, 2013		$ (246)