Overview and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 01, 2021	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021	Jul. 31, 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, adoption date		Aug. 01, 2021		Aug. 01, 2021
Adjustments to Additional Paid in Capital, Other	$ 148,600
Accumulated deficit	100,600	$ (4,217,036)		$ (4,217,036)		$ (3,627,355)
Partner [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Concentration risk percentage		10.00%	10.00%	10.00%	10.00%
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%		0.00%					0.00%
Convertible Notes Payable [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Increase in carrying value of the notes outstanding	$ 48,000
ASU 2020-06
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date		Aug. 01, 2021		Aug. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect	false
ASU 2021-04
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true