Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (167,174)	$ (102,303)	$ (52,727)
Other comprehensive loss:
Foreign currency translation adjustments	54	(470)	931
Other comprehensive income (loss)	54	(470)	931
Total comprehensive loss	$ (167,120)	$ (102,773)	$ (51,796)