SEGMENT AND GEOGRAPHIC INFORMATION - REVENUE BY GEOGRAPHIC REGION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net revenue by geographic region:
Total net revenue	$ 420,167	$ 346,974	$ 731,719	$ 622,271
United States
Net revenue by geographic region:
Total net revenue	252,483	185,102	445,584	328,540
Europe
Net revenue by geographic region:
Total net revenue	107,296	119,510	180,815	219,733
Asia Pacific
Net revenue by geographic region:
Total net revenue	35,622	20,178	64,380	40,484
Canada and Latin America
Net revenue by geographic region:
Total net revenue	$ 24,766	$ 22,184	$ 40,940	$ 33,514