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LONG-TERM DEBT - 2014 Notes (Details) - USD ($)
shares in Thousands
 3 Months Ended 12 Months Ended
Jun. 01, 2021
Jun. 18, 2014
Jul. 31, 2021
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2021
Debt Instrument [Line Items]              
Payment for debt extinguishment, principal       $ 0 $ 0 $ 386,887,000  
2014 Notes              
Debt Instrument [Line Items]              
Debt principal amount   $ 400,000,000          
Coupon interest rate   1.50%          
Proceeds from issuance of convertible notes, net of underwriting discounts   $ 391,900,000          
Repurchased amount in cash             $ 13,100,000
Principal amount - repurchased notes             13,000,000
Payment for debt extinguishment $ 389,800,000            
Payment for debt extinguishment, principal 386,900,000            
Payment for debt extinguishment, interest 2,900,000            
Incremental conversion value $ 57,700,000            
Treasury stock reissued (in shares)     1,250        
2014 Notes | Cumulative Effect, Period of Adoption, Adjustment              
Debt Instrument [Line Items]              
Equity component of currently redeemable convertible notes             $ 78,000,000