Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 742,307	$ 719,514	$ 652,849
United States
Disaggregation of Revenue [Line Items]
Total revenue	462,539	446,586	409,729
Canada
Disaggregation of Revenue [Line Items]
Total revenue	58,995	46,969	45,591
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	18,608	18,118	19,154
Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	540,142	511,673	474,474
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	48,524	39,996	36,653
Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	89,921	96,390	75,178
Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	138,445	136,386	111,831
Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	63,720	71,455	66,544
Subscription and support
Disaggregation of Revenue [Line Items]
Total revenue	203,473	150,474	110,738
Subscription and support | United States
Disaggregation of Revenue [Line Items]
Total revenue	139,059	100,136	71,864
Subscription and support | Canada
Disaggregation of Revenue [Line Items]
Total revenue	18,216	11,171	9,116
Subscription and support | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	4,454	4,450	3,834
Subscription and support | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	161,729	115,757	84,814
Subscription and support | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	6,942	6,844	6,279
Subscription and support | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	19,544	12,118	7,543
Subscription and support | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	26,486	18,962	13,822
Subscription and support | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	15,258	15,755	12,102
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	119,658	65,050	33,401
Support
Disaggregation of Revenue [Line Items]
Total revenue	83,815	85,424	77,337
License
Disaggregation of Revenue [Line Items]
Total revenue	331,554	320,272	275,606
License | United States
Disaggregation of Revenue [Line Items]
Total revenue	174,183	179,726	154,259
License | Canada
Disaggregation of Revenue [Line Items]
Total revenue	36,184	26,329	21,974
License | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	6,374	6,576	7,680
License | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	216,741	212,631	183,913
License | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	36,185	21,648	22,033
License | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	43,988	47,119	35,443
License | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	80,173	68,767	57,476
License | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	34,640	38,874	34,217
Term license
Disaggregation of Revenue [Line Items]
Total revenue	328,489	318,142	263,793
Perpetual license
Disaggregation of Revenue [Line Items]
Total revenue	3,065	2,130	11,813
Services
Disaggregation of Revenue [Line Items]
Total revenue	207,280	248,768	266,505
Services | United States
Disaggregation of Revenue [Line Items]
Total revenue	149,297	166,724	183,606
Services | Canada
Disaggregation of Revenue [Line Items]
Total revenue	4,595	9,469	14,501
Services | Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	7,780	7,092	7,640
Services | Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	161,672	183,285	205,747
Services | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	5,397	11,504	8,341
Services | Other EMEA
Disaggregation of Revenue [Line Items]
Total revenue	26,389	37,153	32,192
Services | Total EMEA
Disaggregation of Revenue [Line Items]
Total revenue	31,786	48,657	40,533
Services | Total APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 13,822	$ 16,826	$ 20,225