Fair Value Measurements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
		Jan. 31, 2023	Jul. 31, 2022	Sep. 30, 2021	Sep. 22, 2021	Sep. 15, 2021	Sep. 24, 2020	Jan. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset						$ 698,200
2023 Convertible Senior Notes | Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage								0.00%
Unamortized debt issuance cost	[1]	$ 0	$ 248
Closing trading price		$ 100
Debt outstanding					$ 145,700
Repayments of debt		$ 145,700
2026 Convertible Senior Notes | Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage		2.50%					2.50%
Non Cash Interest Expense Converted To Principal		$ 37,722	27,997
Unamortized discount	[2]	151,426	169,438
Unamortized debt issuance cost	[2]	$ 17,301	19,359
2027 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage				0.25%
2027 Convertible Senior Notes | Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage		0.25%		0.25%
Unamortized debt issuance cost	[3]	$ 7,231	$ 7,995
Closing trading price		$ 100

[1] Included in the condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the 2023 Notes using the effective interest rate method. The effective interest rate was 0.41%.

[2] Included in the condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the 2026 Notes using the effective interest rate method. The effective interest rate is 7.05%.

[3] Included in the condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the 2027 Notes using the effective interest rate method. The effective interest rate is 0.52%.