Fair Value Measurements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
		Apr. 30, 2022	Sep. 30, 2021	Sep. 15, 2021	Jul. 31, 2021	Sep. 24, 2020	Jan. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability				$ 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%					0.00%
Unamortized discount	[1]	$ 0			$ 48,616
Unamortized debt issuance cost	[1]	$ 396			2,713
Closing trading price		$ 100
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		$ 27,997			8,906
Unamortized discount	[2]	178,210			203,619
Unamortized debt issuance cost	[2]	$ 20,361			$ 23,264
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]	$ 8,376
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. As of July 31, 2021, the effective interest rate was 6.62%. As of April 30, 2022, 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%.