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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 101,268	$ 74,302	$ 194,858	$ 137,600
Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 101,268	$ 74,302	$ 194,858	$ 137,600
Revenue, percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Net | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 101,268	$ 74,302	$ 194,858	$ 137,600
Revenue, percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Net | Customer Concentration Risk | Channel partners
Disaggregation of Revenue [Line Items]
Revenue	$ 98,132	$ 71,074	$ 188,375	$ 131,093
Revenue, percentage	97.00%	96.00%	97.00%	95.00%
Sales Revenue, Net | Customer Concentration Risk | Direct customers
Disaggregation of Revenue [Line Items]
Revenue	$ 3,136	$ 3,228	$ 6,483	$ 6,507
Revenue, percentage	3.00%	4.00%	3.00%	5.00%
United States | Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 49,629	$ 37,626	$ 95,574	$ 67,433
Revenue, percentage	49.00%	51.00%	49.00%	49.00%
Europe, Middle East and Africa | Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 41,002	$ 29,552	$ 79,291	$ 56,946
Revenue, percentage	40.00%	40.00%	41.00%	41.00%
Asia Pacific | Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 8,828	$ 5,674	$ 16,647	$ 10,463
Revenue, percentage	9.00%	7.00%	8.00%	8.00%
Other | Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 1,809	$ 1,450	$ 3,346	$ 2,758
Revenue, percentage	2.00%	2.00%	2.00%	2.00%
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue, percentage	10.00%		11.00%	10.00%

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