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Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Per Share [Abstract]                      
Net income $ 17,661 $ 23,977 $ 16,968 $ 21,116 $ (4,740) $ 13,557 $ 8,181 $ 9,402 $ 79,722 $ 26,400 $ 49,670 [1],[2]
Weighted average shares outstanding (in shares)                 44,886 44,791 45,561 [1]
Dilutive impact from common stock equivalents (in shares)                 435 549 574
Diluted weighted average shares outstanding (in shares)                 45,321 45,340 46,135 [1]
Basic earnings per share (in dollars per share) $ 0.39 $ 0.53 $ 0.38 $ 0.47 $ (0.11) $ 0.30 $ 0.18 $ 0.21 $ 1.78 $ 0.59 $ 1.09 [1]
Diluted earnings per share (in dollars per share) $ 0.39 $ 0.53 $ 0.37 $ 0.46 $ (0.11) $ 0.30 $ 0.18 $ 0.21 $ 1.76 $ 0.58 $ 1.08 [1]
[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.
[2] (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.