Overview and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022	Jul. 31, 2022	Aug. 01, 2021	Sep. 30, 2020	Sep. 24, 2020	Jan. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, immaterial effect						false
Accumulated deficit	$ (4,548,666)		$ (4,548,666)		$ (4,378,362)
Partner [Member] | Customer Concentration Risk [Member] | Revenue
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Partner [Member] | Customer Concentration Risk [Member] | Accounts Receivable
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Concentration risk percentage			24.00%
2026 Convertible Senior Notes | Convertible Debt [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Principal value							$ 750,000
Interest rate, stated percentage	2.50%		2.50%					2.50%
2023 Convertible Senior Notes | Convertible Debt [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Principal value									$ 575,000
Interest rate, stated percentage									0.00%
ASU 2020-06
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted						false
Change in accounting principle, accounting standards update, immaterial effect						false
Accounting Standards Update 2021-04 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted						false