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Earnings per share (Tables)
 9 Months Ended
Aug. 31, 2018
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 Ended
 
Nine Months Ended
 
August 31,
2018
 
August 31,
2017
 
August 31,
2018
 
August 31,
2017
Net income
$
16,746

 
$
11,172

 
$
45,061

 
$
20,988

Weighted average shares outstanding
45,130

 
48,071

 
45,730

 
48,342

Dilutive impact from common stock equivalents
446

 
299

 
650

 
289

Diluted weighted average shares outstanding
45,576

 
48,370

 
46,380

 
48,631

Basic earnings per share
$
0.37

 
$
0.23

 
$
0.99

 
$
0.43

Diluted earnings per share
$
0.37

 
$
0.23

 
$
0.97

 
$
0.43