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Income Taxes
 6 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
 
The components of federal and state income taxes included in the Consolidated Statements of Income are as follows (in thousands): 
                                                         
Six Months Ended 
 March 31,
                                                         
2017
 
2016
Current Income Taxes 
 

 
 

Federal                                              
$
34,113

 
$
7,995

State                                                  
11,509

 
15,537

 
 
 
 
Deferred Income Taxes                                
 

 
 

Federal                                               
51,749

 
(197,982
)
State                                                    
12,032

 
(85,930
)
 
109,403

 
(260,380
)
Deferred Investment Tax Credit                            
(86
)
 
(174
)
 
 
 
 
Total Income Taxes                                      
$
109,317

 
$
(260,554
)
Presented as Follows:
 

 
 

Other Income
(86
)
 
(174
)
Income Tax Expense (Benefit)
109,403

 
(260,380
)
 
 
 
 
Total Income Taxes
$
109,317

 
$
(260,554
)


Total income taxes as reported differ from the amounts that were computed by applying the federal income tax rate to income (loss) before income taxes.  The following is a reconciliation of this difference (in thousands): 
 
Six Months Ended 
 March 31,
 
2017
 
2016
U.S. Income (Loss) Before Income Taxes
$
287,508

 
$
(597,350
)
 
 

 
 

Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35%
$
100,628

 
$
(209,073
)
State Income Taxes (Benefit)
15,302

 
(45,756
)
Miscellaneous
(6,613
)
 
(5,725
)
 
 
 
 
Total Income Taxes
$
109,317

 
$
(260,554
)

 
During the quarter ended March 31, 2017, the balance of unrecognized tax benefits increased by $1.3 million. This balance of unrecognized tax benefits would favorably impact the effective tax rate, if recognized.