SEGMENT AND GEOGRAPHIC INFORMATION - Summary of Total Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 256,863	$ 272,048	$ 482,619	$ 541,000
United States
Segment Reporting Information [Line Items]
Total revenue	153,632	180,059	292,250	349,367
Europe
Segment Reporting Information [Line Items]
Total revenue	43,102	40,680	78,550	82,737
Asia
Segment Reporting Information [Line Items]
Total revenue	25,201	19,175	44,728	44,618
Rest of the world
Segment Reporting Information [Line Items]
Total revenue	$ 34,928	$ 32,134	$ 67,091	$ 64,278