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Common Stock and Stock Compensation (Tables)
 6 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation costs included in net income
Our net income includes the following compensation expense (benefit) related to our stock compensation arrangements:
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
 
(in thousands)
Gross compensation cost (benefit)
$
530

 
$
6,990

 
$
(1,928
)
 
$
8,197

Income tax expense (benefit)
179

 
(2,444
)
 
(855
)
 
(2,869
)
Net compensation expense (benefit)
$
709

 
$
4,546

 
$
(2,783
)
 
$
5,328