Commitments and Contingencies - Additional Information (Detail)	12 Months Ended				1 Months Ended
	Mar. 31, 2014 USD ($) sqft	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Apr. 30, 2014 Subsequent Event USD ($)	Jul. 31, 2013 Europe Lease Agreements sqft	Mar. 31, 2014 Europe Lease Agreements USD ($)	Mar. 31, 2014 Europe Lease Agreements EUR (€)	Mar. 31, 2014 For March 2014 through April 2014 USD ($)	Mar. 31, 2014 For March 2018 through February 2021 USD ($)	Mar. 31, 2014 For May 2014 through February 2016 USD ($)	Mar. 31, 2014 For March 2016 through February 2018 USD ($)
Commitments and Contingencies [Line Items]
Office space under operating lease	96,000				33,000
Facilities leases, base rent per month						$ 47,000,000	€ 34,500,000	$ 66,000,000	$ 72,750,000	$ 74,050,000	$ 70,750,000
Lease, expiration date					Jul. 31, 2023
Rent expense	1,500,000	1,600,000	1,600,000
License agreement, upfront payment				1,500,000
License agreement, maximum agreed additional payments upon achievement of development milestones				$ 4,500,000