Fair Value Measurements - Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Convertible Debt - USD ($) $ in Thousands		Apr. 30, 2022	Jul. 31, 2021	[1]
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		$ 1,291,358	$ 1,055,694
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		1,577,502	1,731,225
2023 Convertible Senior Notes | Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		145,308	523,671
2023 Convertible Senior Notes | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		143,518	602,272
2026 Convertible Senior Notes | Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		579,426	532,023
2026 Convertible Senior Notes | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		967,975	1,128,953
2027 Convertible Senior Notes | Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	[2]	566,624	0
2027 Convertible Senior Notes | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	[2]	$ 466,009	$ 0

[1] Prior period amounts have not been adjusted due to our adoption of ASU 2020-06 under the modified retrospective method. For additional information on our adoption of ASU 2020-06, refer to Note 1 and Note 5.

[2] The 2027 Notes were issued in September 2021.