CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (222,806)	$ (189,719)	$ (388,600)	$ (392,939)
Other comprehensive income (loss):
Foreign currency translation adjustments	(1,074)	(54)	(3,050)	298
Net change in unrealized gains (losses) on available-for-sale debt securities	(196)	829	(28,521)	404
Total other comprehensive income (loss)	(1,270)	775	(31,571)	702
Comprehensive loss	$ (224,076)	$ (188,944)	$ (420,171)	$ (392,237)