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Income Taxes (Tables)
 9 Months Ended
Jun. 30, 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): 
                                                         
Nine Months Ended 
 June 30,
                                                         
2017
 
2016
Current Income Taxes 
 

 
 

Federal                                              
$
29,832

 
$
(686
)
State                                                  
10,290

 
18,293

 
 
 
 
Deferred Income Taxes                                
 

 
 

Federal                                               
81,163

 
(184,419
)
State                                                    
23,910

 
(84,829
)
 
145,195

 
(251,641
)
Deferred Investment Tax Credit                            
(130
)
 
(261
)
 
 
 
 
Total Income Taxes                                      
$
145,065

 
$
(251,902
)
Presented as Follows:
 

 
 

Other Income
(130
)
 
(261
)
Income Tax Expense (Benefit)
145,195

 
(251,641
)
 
 
 
 
Total Income Taxes
$
145,065

 
$
(251,902
)
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): 
 
Nine Months Ended 
 June 30,
 
2017
 
2016
U.S. Income (Loss) Before Income Taxes
$
382,971

 
$
(580,412
)
 
 

 
 

Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35%
$
134,040

 
$
(203,144
)
State Income Taxes (Benefit)
22,230

 
(43,248
)
Miscellaneous
(11,205
)
 
(5,510
)
 
 
 
 
Total Income Taxes
$
145,065

 
$
(251,902
)