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STOCK-BASED COMPENSATION - Restricted Stock Units (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jul. 31, 2022
USD ($)
$ / shares
shares
Jul. 31, 2021
$ / shares
shares
Summary of award activity    
Beginning balance (in shares) 2,454 2,950
Granted (in shares) 1,600 1,316
Released (in shares) (878) (1,283)
Forfeited (in shares) (94) (110)
Ending balance (in shares) 3,082 2,873
Weighted-Average Grant-Date Fair Value    
Beginning balance (in dollars per share) | $ / shares $ 42.99 $ 35.97
Granted (in dollars per share) | $ / shares 56.14 48.51
Released (in dollars per share) | $ / shares 43.15 35.52
Forfeited (in dollars per share) | $ / shares 45.73 39.00
Ending balance (in dollars per share) | $ / shares $ 49.69 $ 41.81
Restricted Stock Units (RSUs)    
Summary of award activity    
Granted (in shares) 1,322  
Additional disclosures    
Unrecognized compensation expense | $ $ 107.1  
Remaining weighted-average vesting period over which expense is expected to be recognized (in years) 1 year 10 months 24 days