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Convertible Senior Notes - Schedule of interest expense recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Debt Instrument [Line Items]        
Contractual interest expense $ 4,833 $ 4,651 $ 9,627 $ 9,271
Senior Notes | Convertible Debt        
Debt Instrument [Line Items]        
Contractual interest expense 1,250 1,250 2,500 2,500
Amortization of debt discount 3,215 3,057 6,391 6,077
Amortization of debt issuance costs 357 322 705 637
Total $ 4,822 $ 4,629 $ 9,596 $ 9,214
Effective interest rate 5.53%   5.53%