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LONG-TERM DEBT - 2014 Notes (Details) - USD ($)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2021
Jun. 18, 2014
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2022
Jul. 31, 2021
Debt Instrument [Line Items]              
Losses on early retirements of debt     $ 0 $ 0   $ 0 $ 2,474,000
Payment for debt extinguishment, principal           $ 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    
Losses on early retirements of debt         100,000    
Reacquisition of equity component from convertible notes repurchases, net of taxes         $ 200,000    
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