CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (111,000)	$ (210,000)	$ (230,000)	$ (453,000)
Other comprehensive income (loss):
Net change in unrealized gains or losses on available-for-sale securities	3,000	(2,000)	14,000	(19,000)
Foreign currency translation adjustments	3,000	(3,000)	5,000	(10,000)
Other comprehensive income (loss)	6,000	(5,000)	19,000	(29,000)
Comprehensive loss	$ (105,000)	$ (215,000)	$ (211,000)	$ (482,000)