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Computation of Earnings Per Share (Tables)
 12 Months Ended
May. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation of Denominator Used in Computation of Basic and Diluted Earnings per Share
The following is a reconciliation of the denominator used in the computation of basic and diluted EPS for the fiscal years ended May 31:
 
2015
 
2014
 
2013
Denominator:
 
 
 
 
 
Denominator for basic earnings per share—weighted average common shares outstanding (including shares issuable for vested restricted stock units)
24,360

 
24,325

 
24,226

Effect of unvested restricted stock units
18

 
32

 
43

Diluted shares used in per share calculation
24,378

 
24,357

 
24,269

Net income
$
15,432

 
$
20,408

 
$
22,754

Earnings per share:
 
 
 
 
 
Basic
$
0.63

 
$
0.84

 
$
0.94

Diluted
$
0.63

 
$
0.84

 
$
0.94