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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per share
The following information was used in the computation of basic earnings per share (EPS) for the years ended September 30, 2016, 2015 and 2014.
 
2016
 
2015
 
2014
 
(dollars in thousands, except per share data)
Net income
$
121,253

 
$
109,065

 
$
104,952

 
 
 
 
 
 
Weighted average common shares outstanding
56,563,438

 
57,455,693

 
57,886,114

Dilutive effect of stock based compensation
165,912

 
45,185

 
—

Weighted average common shares outstanding for diluted earnings per share calculation
56,729,350

 
57,500,878

 
57,886,114

 
 
 
 
 
 
Basic earnings per share
$
2.14

 
$
1.90

 
$
1.81

Diluted earnings per share
$
2.14

 
$
1.90

 
$
1.81