Fair Value Measurements - Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Convertible Debt - USD ($) $ in Thousands		Jul. 31, 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		$ 1,301,661	$ 1,055,694
Reported Value Measurement | 2023 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		145,456	523,671
Reported Value Measurement | 2026 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		589,200	532,023
Reported Value Measurement | 2027 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	[2]	567,005	0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		1,302,492	1,731,225
Estimate of Fair Value Measurement | 2023 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		143,154	602,272
Estimate of Fair Value Measurement | 2026 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure		759,086	1,128,953
Estimate of Fair Value Measurement | 2027 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	[2]	$ 400,252	$ 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.