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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 01, 2021
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2022
Jul. 31, 2021
Class of Stock [Line Items]              
Treasury stock repurchased (in shares)           2,000,000  
Treasury stock repurchased   $ 14 $ 105,666 $ 12 $ 25,868 $ 105,700  
Common stock repurchased and retired         $ 49,581    
Number of common stock acquired (in shares)             1,602,000
Cost of common stock repurchased             $ 75,500
Settlement of conversion premium upon maturity of 2014 Notes       $ (8)      
2014 Notes              
Class of Stock [Line Items]              
Treasury stock reissued (in shares)       1,250,000      
Treasury stock reissued, average cost per share (in dollars per share)       $ 47.30      
Settlement of conversion premium upon maturity of 2014 Notes       $ 59,100      
Note hedges, shares received upon settlement (in shares) 1,250,000            
Note hedges, shares received upon settlement, value $ 57,700            
Note hedges, number of shares received pertaining to reimbursement 42,000            
Note hedges, common stock value pertaining to reimbursement $ 2,000            
2022 Stock Repurchase Program              
Class of Stock [Line Items]              
Common stock repurchased and retired (in shares)           2,000,000  
Common stock repurchased and retired           $ 105,700  
2021 Share Repurchase Program              
Class of Stock [Line Items]              
Common stock repurchased and retired (in shares)             1,058,300
Common stock repurchased and retired             $ 49,600
Cost of common stock repurchased             $ 75,400