Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 162,867	$ 162,867	$ 142,149	$ 511,656	$ 412,589
United States
Disaggregation of Revenue [Line Items]
Total revenue		105,519		314,829
Canada
Disaggregation of Revenue [Line Items]
Total revenue		10,906		38,726
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue		4,555		11,210
Total Americas
Disaggregation of Revenue [Line Items]
Total revenue		120,980		364,765
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue		5,236		28,933
Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue		16,739		62,197
Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue		21,975		91,130
Total APAC
Disaggregation of Revenue [Line Items]
Total revenue		$ 19,912		55,761
License and subscription
Disaggregation of Revenue [Line Items]
Total revenue	76,218		52,392	257,611	165,310
License and subscription | United States
Disaggregation of Revenue [Line Items]
Total revenue	48,439			146,336
License and subscription | Canada
Disaggregation of Revenue [Line Items]
Total revenue	6,436			24,605
License and subscription | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	1,688			2,660
License and subscription | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	56,563			173,601
License and subscription | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	990			16,624
License and subscription | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	4,260			28,806
License and subscription | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	5,250			45,430
License and subscription | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	14,405			38,580
Term license
Disaggregation of Revenue [Line Items]
Total revenue	60,252			211,205
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	14,691			44,779
Perpetual license
Disaggregation of Revenue [Line Items]
Total revenue	1,275			1,627
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	21,335		18,749	63,602	56,789
Maintenance | United States
Disaggregation of Revenue [Line Items]
Total revenue	13,648			40,060
Maintenance | Canada
Disaggregation of Revenue [Line Items]
Total revenue	2,167			6,587
Maintenance | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	1,112			3,293
Maintenance | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	16,927			49,940
Maintenance | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	1,118			3,428
Maintenance | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	1,722			5,334
Maintenance | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	2,840			8,762
Maintenance | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	1,568			4,900
Services
Disaggregation of Revenue [Line Items]
Total revenue	65,314		$ 71,008	190,443	$ 190,490
Services | United States
Disaggregation of Revenue [Line Items]
Total revenue	43,432			128,433
Services | Canada
Disaggregation of Revenue [Line Items]
Total revenue	2,303			7,534
Services | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	1,755			5,257
Services | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	47,490			141,224
Services | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	3,128			8,881
Services | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	10,757			28,057
Services | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	13,885			36,938
Services | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,939			$ 12,281