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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2022
USD ($)
day
$ / shares
Mar. 31, 2021
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2022
USD ($)
Jul. 31, 2021
USD ($)
Jul. 31, 2022
USD ($)
Jul. 31, 2021
USD ($)
Debt Instrument [Line Items]              
Gross Amount       $ 300,000,000   $ 300,000,000  
Carrying Amount       294,334,000   294,334,000  
Estimated Fair Value       246,000,000   246,000,000  
Line of Credit              
Debt Instrument [Line Items]              
Extinguishment of debt   $ 35,000,000          
Interest and prepayment fees   $ 1,200,000          
Convertible Senior Notes | Convertible Debt              
Debt Instrument [Line Items]              
Gross Amount       300,000,000   300,000,000  
Carrying Amount $ 294,000,000     $ 294,334,000   $ 294,334,000  
Conversion ratio 0.0416146            
Conversion price (USD per share) | $ / shares $ 24.03            
Ratio of repurchase price to principal amount           100.00%  
Ratio of control price to principal amount           125.00%  
Interest rate, effective percentage       3.93%   3.93%  
Estimated Fair Value       $ 246,000,000   $ 246,000,000  
Debt instrument, face amount $ 300,000,000            
Convertible Senior Notes | Convertible Debt | Period One              
Debt Instrument [Line Items]              
Threshold trading days | day 20            
Threshold consecutive trading days | day 30            
Threshold percentage of stock price trigger 130.00%            
Convertible Senior Notes | Convertible Debt | Period Two              
Debt Instrument [Line Items]              
Threshold trading days | day 5            
Threshold consecutive trading days | day 10            
Threshold percentage of stock price trigger 98.00%            
Convertible Senior Notes | Convertible Debt | Cash Interest              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.50%            
Convertible Senior Notes | Convertible Debt | Paid In Kind Interest              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.00%            
Convertible Senior Notes | Secured Debt              
Debt Instrument [Line Items]              
Maximum covenant threshold       $ 750,000,000   $ 750,000,000  
Trustee percentage (as a percent)       25.00%   25.00%  
Declare percentage       100.00%   100.00%  
Medium-term Notes | 2018 Loan | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 45,000,000        
Gross Amount     35,000,000        
Issuance costs     1,100,000        
Net proceeds from line of credit     $ 33,900,000        
Debt maturity (in years)     5 years        
Interest expense       $ 0 $ 1,500,000 $ 0 $ 1,500,000
Medium-term Notes | 2018 Loan | Line of Credit | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate     6.55%