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Earnings Per Common Share (Tables)
 3 Months Ended
Dec. 31, 2012
Earnings Per Common Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The computation of basic and diluted earnings per share for the three months ended December 31, 2012 and 2011 is as follows (in thousands, except per share amounts):
 
 
Three Months Ended
 
Net Income
 
Shares
 
Per Share
Amount
December 31, 2012
 
 
 
 
 
Basic earnings per share
$
72,831

 
65,528
 
$
1.11

Effect of dilutive securities:
 
 
 
 
 
Stock options
—

 
409
 
$
(0.01
)
Restricted stock
—

 
155
 
$
—

Diluted earnings per share
$
72,831

 
66,092
 
$
1.10

December 31, 2011
 
 
 
 
 
Basic earnings per share
$
65,468

 
65,024
 
$
1.01

Effect of dilutive securities:
 
 
 
 
 
Stock options
—

 
348
 
$
(0.01
)
Restricted stock
—

 
169
 
$
—

Diluted earnings per share
$
65,468

 
65,541
 
$
1.00