STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Shares or Units
Beginning balance (in shares)	2,658	2,230
Granted (in shares)	2,261	1,665
Released (in shares)	(410)	(475)
Forfeited (in shares)	(111)	(32)
Ending balance (in shares)	4,398	3,388
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 43.29	$ 52.42
Granted (in dollars per share)	29.56	37.36
Released (in dollars per share)	52.28	50.22
Forfeited (in dollars per share)	55.71	50.63
Ending balance (in dollars per share)	$ 35.08	$ 45.34
Additional disclosures
Granted (in shares)	2,261	1,665
Restricted Stock Units (RSUs)
Shares or Units
Granted (in shares)	1,903
Additional disclosures
Granted (in shares)	1,903
Unrecognized compensation expense	$ 117.3
Remaining weighted-average vesting period over which expense is expected to be recognized (in years)	2 years 2 months 12 days