Fair Value Measurements - Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Convertible Debt - USD ($)
$ in Thousands
Jan. 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 $ 1,271,621 $ 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 1,655,616 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 145,160 523,671
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 143,737 602,272
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 560,218 532,023
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 1,022,732 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] 566,243 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] $ 489,147 $ 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.