Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Mar. 31, 2012 Europe USD ($)	Mar. 31, 2012 Europe EUR (€)	Mar. 31, 2013 For November 2008 through June 2010 USD ($)	Mar. 31, 2013 For July 2010 through February 2014 USD ($)	Mar. 31, 2013 For March 2014 through February 2016 USD ($)
Commitments and Contingencies [Line Items]
Facilities leases, base rent per month				$ 50,000,000	€ 36,000,000	$ 40,000,000	$ 64,350,000	$ 66,000,000
Existing Lease, expiration date				Dec. 31, 2012	Dec. 31, 2012
Extended Lease rental rate arrangement, expiration date				Jun. 30, 2013	Jun. 30, 2013
Rent expense	$ 1,600,000	$ 1,600,000	$ 2,700,000