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Earnings per share (Tables)
 6 Months Ended
May 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 EndedSix Months Ended
 May 31, 2022May 31, 2021May 31, 2022May 31, 2021
Net income$29,110 $13,557 $49,564 $32,518 
Weighted average shares outstanding43,575 43,818 43,778 43,963 
Basic earnings per common share$0.67 $0.31 $1.13 $0.74 
Diluted earnings per common share:
Net income$29,110 $13,557 $49,564 $32,518 
Weighted average shares outstanding43,575 43,818 43,778 43,963 
Effect of dilution from common stock equivalents678 654 702 599 
Diluted weighted average shares outstanding44,253 44,472 44,480 44,562 
Diluted earnings per share$0.66 $0.30 $1.11 $0.73