CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (88,739)	$ (104,497)	$ (4,751)
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments in securities	473	(259)	70
Foreign currency translation adjustment	(2,181)	4,256	(5,528)
Comprehensive loss	$ (90,447)	$ (100,500)	$ (10,209)