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Net Income Per Share (Tables)
 6 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of net (loss) income per share
The following table provides our basic and diluted net income per share for the three and six months ended March 31, 2018 and 2017 (dollars in thousands except share data):
 
Three Months Ended 
 March 31,
 
Six Months Ended 
 March 31,
 
2018
 
2017
 
2018
 
2017
Net income
$
15,000

 
$
17,442

 
$
14,626

 
$
30,549

Basic weighted average shares outstanding
99,136,015

 
98,709,557

 
99,116,250

 
98,512,601

Dilutive effect of stock options and restricted stock
383,910

 
308,429

 
325,135

 
387,836

Dilutive weighted average shares outstanding
$
99,519,925

 
$
99,017,986

 
$
99,441,385

 
$
98,900,437

Basic net income per share
$
0.15

 
$
0.18

 
$
0.15

 
$
0.31

Diluted net income per share
$
0.15

 
$
0.18

 
$
0.15

 
$
0.31