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Income Taxes (Tables)
 6 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Components Of Federal And State Income Taxes Included In The Consolidated Statements Of Income
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
)
Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate
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
)