Business Segments and International Operations (Income from Continuing Operations by Segment) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020 USD ($)	Aug. 31, 2019 USD ($)	Aug. 31, 2020 USD ($) segment	Aug. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment revenue	$ 109,699	$ 106,716	$ 319,765	$ 296,260
Segment costs of revenue and operating expenses	27,587	30,747	83,796	82,439
Segment contribution margin	82,112	75,969	235,969	213,821
Other unallocated expenses	48,919	60,009	146,755	167,711
Income from operations	33,193	15,960	89,214	46,110
Other expense, net	(2,962)	(3,718)	(9,206)	(8,038)
Income before income taxes	30,231	12,242	80,008	38,072
OpenEdge
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment revenue	85,794	78,607	240,608	211,679
Segment costs of revenue and operating expenses	18,358	22,711	55,984	60,123
Segment contribution margin	67,436	55,896	184,624	151,556
Data Connectivity and Integration
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment revenue	4,468	8,754	21,815	27,686
Segment costs of revenue and operating expenses	1,931	1,943	6,240	5,249
Segment contribution margin	2,537	6,811	15,575	22,437
Application Development and Deployment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment revenue	19,437	19,355	57,342	56,895
Segment costs of revenue and operating expenses	7,298	6,093	21,572	17,067
Segment contribution margin	$ 12,139	$ 13,262	$ 35,770	$ 39,828