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Earnings per share (Tables)
 9 Months Ended
Aug. 31, 2022
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings Per Share The following table sets forth the calculation of basic and diluted earnings per share on an interim basis (in thousands, except per share data):
 Three Months EndedNine Months Ended
 August 31, 2022August 31, 2021August 31, 2022August 31, 2021
Net income$21,797 $30,976 $71,361 $63,494 
Weighted average shares outstanding43,211 43,762 43,589 43,896 
Basic earnings per common share$0.50 $0.71 $1.64 $1.45 
Diluted earnings per common share:
Net income$21,797 $30,976 $71,361 $63,494 
Weighted average shares outstanding43,211 43,762 43,589 43,896 
Effect of dilution from common stock equivalents724 740 710 646 
Diluted weighted average shares outstanding43,935 44,502 44,299 44,542 
Diluted earnings per share$0.50 $0.70 $1.61 $1.43