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	$ (210,472)	$ (276,682)	$ (453,185)	$ (385,914)
Other comprehensive loss:
Net change in unrealized gains or losses on available-for-sale securities	(1,497)	(353)	(18,699)	(1,166)
Foreign currency translation adjustments	(3,541)	(882)	(10,478)	151
Other comprehensive loss	(5,038)	(1,235)	(29,177)	(1,015)
Comprehensive loss	$ (215,510)	$ (277,917)	$ (482,362)	$ (386,929)