Business Segments and International Operations (Revenue from External Customers by Product) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 109,699	$ 106,716	$ 319,765	$ 296,260
Software licenses
Segment Reporting Information [Line Items]
Total revenue	27,514	30,686	77,806	83,216
Performance obligations transferred at a point in time | Software licenses
Segment Reporting Information [Line Items]
Total revenue	27,514	30,686	77,806	83,216
Performance obligations transferred over time | Maintenance
Segment Reporting Information [Line Items]
Total revenue	72,764	67,611	214,506	190,138
Performance obligations transferred over time | Services
Segment Reporting Information [Line Items]
Total revenue	$ 9,421	$ 8,419	$ 27,453	$ 22,906