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Convertible Senior Notes - Schedule of interest expense recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Debt Instrument [Line Items]    
Contractual interest expense $ 4,794 $ 4,620
Senior Notes | Convertible Debt    
Debt Instrument [Line Items]    
Contractual interest expense 1,250 1,250
Amortization of debt discount 3,176 3,020
Amortization of debt issuance costs 348 315
Total $ 4,774 $ 4,585
Effective interest rate 5.53%