Balance Sheet Components (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	2 years 8 months 12 days
Cost	$ 140,700	$ 140,700
Accumulated Amortization	100,992	74,158
Total future amortization expense	$ 39,708	66,542
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	1 year 8 months 12 days
Cost	$ 93,600	93,600
Accumulated Amortization	73,191	53,970
Total future amortization expense	$ 20,409	39,630
Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	3 years 9 months 18 days
Cost	$ 35,700	35,700
Accumulated Amortization	18,500	12,566
Total future amortization expense	$ 17,200	23,134
Partner relationships
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	4 years 8 months 12 days
Cost	$ 200	200
Accumulated Amortization	96	74
Total future amortization expense	$ 104	126
Trademarks
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	4 years 3 months 18 days
Cost	$ 2,500	2,500
Accumulated Amortization	982	625
Total future amortization expense	$ 1,518	1,875
Order backlog
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	7 months 6 days
Cost	$ 8,700	8,700
Accumulated Amortization	8,223	6,923
Total future amortization expense	$ 477	$ 1,777