Balance Sheet Components (Details 5) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2019	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 140,700	$ 140,700
Accumulated Amortization	59,663	45,046
Net Book Value	81,037	95,654
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Cost	93,600	93,600
Accumulated Amortization	44,079	34,189
Net Book Value	49,521	59,411
Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Cost	35,700	35,700
Accumulated Amortization	9,600	6,633
Net Book Value	26,100	29,067
Partner relationships
Finite-Lived Intangible Assets [Line Items]
Cost	200	200
Accumulated Amortization	63	52
Net Book Value	137	148
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	2,500	2,500
Accumulated Amortization	446	268
Net Book Value	2,054	2,232
Order backlog
Finite-Lived Intangible Assets [Line Items]
Cost	8,700	8,700
Accumulated Amortization	5,475	3,904
Net Book Value	$ 3,225	$ 4,796
Weighted Average
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Weighted Average | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	4 years 6 months
Weighted Average | Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years 10 months 24 days
Weighted Average | Partner relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	9 years
Weighted Average | Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Weighted Average | Order backlog
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	4 years 4 months 24 days