Convertible Senior Notes - Schedule of interest expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended
Oct. 31, 2022	Oct. 31, 2021
Debt Instrument [Line Items]
Contractual interest expense	$ 1,674	$ 4,794
Senior Notes \| Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	1,250	1,250
Amortization of debt discount(1)	0	3,176
Amortization of debt issuance costs	423	348
Total	$ 1,673	$ 4,774

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

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