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Business Segments and International Operations (Revenue from External Customers by Revenue Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 30, 2020
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Segment Reporting Information [Line Items]                      
Total revenue $ 122,385 $ 109,699 $ 100,383 $ 109,683 $ 117,038 $ 106,716 $ 99,995 $ 89,549 $ 442,150 $ 413,298 $ 378,981 [1]
Software licenses                      
Segment Reporting Information [Line Items]                      
Total revenue                 115,249 122,552 99,800 [1]
Transferred at Point in Time | Software licenses                      
Segment Reporting Information [Line Items]                      
Total revenue                 115,249 122,552 99,800
Transferred over Time | Maintenance                      
Segment Reporting Information [Line Items]                      
Total revenue                 288,887 259,006 249,171
Transferred over Time | Services                      
Segment Reporting Information [Line Items]                      
Total revenue                 $ 38,014 $ 31,740 $ 30,010
[1] (1)The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.