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Capital Stock and Share Repurchase (Tables)
 9 Months Ended
May 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share amounts):
 
Three Months Ended May 31,
 
Nine Months Ended May 31,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net earnings
$
29,012

 
$
22,511

 
$
16,017

 
$
32,551

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
60,683

 
59,675

 
60,291

 
59,339

Net effect of dilutive securities - stock based compensation plans
381

 
727

 
559

 
716

Weighted average common shares outstanding - diluted
61,064

 
60,402

 
$
60,850

 
$
60,055

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.48

 
$
0.38

 
$
0.27

 
$
0.55

Diluted earnings per share
$
0.48

 
$
0.37

 
$
0.26

 
$
0.54

 
 
 
 
 
 
 
 
Anti-dilutive securities from stock based compensation plans (excluded from earnings per share calculation)
1,788

 
1,969

 
2,338

 
1,981