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Income Taxes (Table)
12 Months Ended
Sep. 30, 2011
Income Taxes Tables Abstract 
Schedule of Components of Income Tax Expense (Benefit)
   2011  2010  2009
  (In thousands)
Current        
 Federal$(11,204) $(72,234) $(37,141)
 State 6,533  6,179  8,720
Deferred        
 Federal 112,612  179,271  134,912
 State 5,920  11,429  (8,739)
Investment tax credits  (172)  (283)  (390)
  $113,689 $124,362 $97,362
Schedule of Effective Income Tax Rate Reconciliation
   2011  2010  2009
   (In thousands)
          
Tax at statutory rate of 35%$109,401 $112,922 $98,231
Common stock dividends deductible        
 for tax reporting (1,930)  (1,785)  (1,591)
Penalties  2,294   107   72
Settlement of uncertain tax positions  (4,950)   -   -
State taxes (net of federal benefit) 8,184  11,445  (13)
Other, net 690  1,673  663
Income tax expense$113,689 $124,362 $97,362
Schedule of Deferred Tax Assets and Liabilities
     2011  2010
     (In thousands)
Deferred tax assets:      
 Accruals not currently deductible for tax purposes $ 10,327 $ 9,182
 Customer advances   5,271   5,723
 Nonqualified benefit plans   43,924   43,427
 Postretirement benefits   62,274   57,386
 Treasury lock agreements   20,060   3,211
 Unamortized investment tax credit   120   183
 Tax net operating loss and credit carryforwards   95,293   63,621
 Difference between book and tax on mark to market      
  accounting   8,039   2,159
 Other, net   3,529   4,559
  Total deferred tax assets   248,837   189,451
         
Deferred tax liabilities:      
 Difference in net book value and net tax value      
  of assets   (1,108,063)   (940,914)
 Pension funding   (7,533)   (14,936)
 Gas cost adjustments   (13,570)   (6,473)
 Cost expensed for tax purposes and capitalized for book      
  purposes   (3,039)   (2,330)
  Total deferred tax liabilities   (1,132,205)   (964,653)
Net deferred tax liabilities $ (883,368) $ (775,202)
Deferred credits for rate regulated entities $ 325 $ 587