Convertible Senior Notes - Interest Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Debt Instrument [Line Items]
Non-cash interest expense			$ 14,408	$ 11,331
Convertible Debt | 2023 Convertible Senior Notes
Debt Instrument [Line Items]
Interest expense related to amortization of debt discount	$ 0	$ 7,985	0	23,564
Interest expense related to amortization of debt issuance costs	148	446	696	1,315
Total interest expense	148	8,431	696	24,879
Convertible Debt | 2026 Convertible Senior Notes
Debt Instrument [Line Items]
Interest expense related to amortization of debt discount	8,619	8,034	25,408	19,115
Interest expense related to amortization of debt issuance costs	985	917	2,904	2,184
Non-cash interest expense	4,833	4,716	14,408	11,331
Total interest expense	14,437	$ 13,667	42,720	$ 32,630
Convertible Debt | 2027 Convertible Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	359		870
Interest expense related to amortization of debt issuance costs	381		921
Total interest expense	$ 740		$ 1,791