SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011
SEGMENT AND GEOGRAPHIC INFORMATION
Number of reportable segments			1
Net revenue by geographic region:
Total net revenue	$ 415,773	$ 236,325	$ 914,996	$ 677,739
United States
Net revenue by geographic region:
Total net revenue	271,555	153,768	530,642	354,547
Europe
Net revenue by geographic region:
Total net revenue	87,788	50,391	243,600	212,114
Canada and Latin America
Net revenue by geographic region:
Total net revenue	26,018	13,985	70,878	53,880
Asia Pacific
Net revenue by geographic region:
Total net revenue	$ 30,412	$ 18,181	$ 69,876	$ 57,198