Convertible Senior Notes - Schedule of interest expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 4,620	$ 4,429
Senior Notes \| Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	1,250	1,250
Amortization of debt discount	3,020	2,871
Amortization of debt issuance costs	315	284
Total	$ 4,585	$ 4,405
Effective interest rate	5.53%

Amortization of Debt Issuance Costs and Discounts And Debt Interest Expense

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount of the cost of borrowed funds accounted for as interest expense.

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