Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands		9 Months Ended
		Apr. 30, 2022	Jul. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment, gross		$ 476,517	$ 448,769
Less: accumulated depreciation	[1]	(359,023)	(317,148)
Total property and equipment, net		$ 117,494	131,621
Computer, production, engineering and other equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life		36 months
Total property and equipment, gross		$ 336,552	300,583
Demonstration units
Property, Plant and Equipment [Line Items]
Estimated Useful Life		12 months
Total property and equipment, gross		$ 62,456	68,992
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	[2]	$ 61,036	62,676
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life		60 months
Total property and equipment, gross		$ 16,473	$ 16,518

[1] Includes a $0.9 million write-off related to the impairment of certain leasehold improvements during the fiscal quarter ended October 31, 2020. For additional information on this lease-related impairment, refer to Note 6.

[2] Leasehold improvements are amortized over the shorter of the estimated useful lives of the improvements or the remaining lease term.