Balance Sheet Components (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Jul. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 140,700	$ 140,700
Accumulated Amortization	107,315	100,992
Net Book Value	33,385	39,708
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Cost	93,600	93,600
Accumulated Amortization	77,717	73,191
Net Book Value	15,883	20,409
Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Cost	35,700	35,700
Accumulated Amortization	19,983	18,500
Net Book Value	15,717	17,200
Partner relationships
Finite-Lived Intangible Assets [Line Items]
Cost	200	200
Accumulated Amortization	102	96
Net Book Value	98	104
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	2,500	2,500
Accumulated Amortization	1,071	982
Net Book Value	1,429	1,518
Order backlog
Finite-Lived Intangible Assets [Line Items]
Cost	8,700	8,700
Accumulated Amortization	8,442	8,223
Net Book Value	$ 258	$ 477
Weighted Average
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	2 years 7 months 6 days
Weighted Average | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	1 year 7 months 6 days
Weighted Average | Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	3 years 7 months 6 days
Weighted Average | Partner relationships
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	4 years 4 months 24 days
Weighted Average | Trademarks
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	4 years
Weighted Average | Order backlog
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (in years)	3 months 18 days