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Income Taxes (Table)
12 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The components of income tax expense from continuing operations for 2016, 2015 and 2014 were as follows:
 
2016
 
2015
 
2014
 
(In thousands)
Current
 
 
 
 
 
Federal
$

 
$

 
$

State
6,822

 
7,251

 
5,527

Deferred
 
 
 
 
 
Federal
181,790

 
175,897

 
169,106

State
11,766

 
12,548

 
12,375

Investment tax credits
(5
)
 
(6
)
 
(6
)
 
$
200,373

 
$
195,690

 
$
187,002

Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of the provision for income taxes computed at the statutory rate to the reported provisions for income taxes from continuing operations for 2016, 2015 and 2014 are set forth below:
 
2016
 
2015
 
2014
 
(In thousands)
Tax at statutory rate of 35%
$
192,667

 
$
178,768

 
$
166,887

Common stock dividends deductible for tax reporting
(2,570
)
 
(2,413
)
 
(2,307
)
State taxes (net of federal benefit)
11,504

 
12,869

 
11,636

Change in valuation allowance
1,324

 
4,998

 
6,969

Other, net
(2,552
)
 
1,468

 
3,817

Income tax expense
$
200,373

 
$
195,690

 
$
187,002

Schedule of Deferred Tax Assets and Liabilities
The tax effect of temporary differences that gave rise to significant components of the deferred tax liabilities and deferred tax assets at September 30, 2016 and 2015 are presented below:
 
2016
 
2015
 
(In thousands)
Deferred tax assets:
 
 
 
Employee benefit plans
$
122,682

 
$
121,619

Interest rate agreements
107,782

 
51,067

Net operating loss carryforwards
514,391

 
313,224

Charitable and other credit carryforwards
22,273

 
22,281

Other
23,648

 
36,695

Total deferred tax assets
790,776

 
544,886

Valuation allowance
(10,481
)
 
(10,872
)
Net deferred tax assets
780,295

 
534,014

Deferred tax liabilities:
 
 
 
Difference in net book value and net tax value of assets
(2,259,278
)
 
(1,890,886
)
Pension funding
(30,652
)
 
(35,247
)
Gas cost adjustments
(54,725
)
 
(43,634
)
Other
(38,696
)
 
(31,480
)
Total deferred tax liabilities
(2,383,351
)
 
(2,001,247
)
Net deferred tax liabilities
$
(1,603,056
)
 
$
(1,467,233
)
Deferred credits for rate regulated entities
$
861

 
$
412

Schedule of Unrecognized Tax Benefits Roll Forward
The following table reconciles the beginning and ending balance of our unrecognized tax benefits:
 
2016
 
2015
 
(In thousands)
Unrecognized tax benefits - beginning balance
$
17,069

 
$
12,629

Increase (decrease) resulting from prior period tax positions
(290
)
 
1,009

Increase resulting from current period tax positions
3,519

 
3,431

Unrecognized tax benefits - ending balance
20,298

 
17,069

Less: deferred federal and state income tax benefits
(7,104
)
 
(5,974
)
Total unrecognized tax benefits that, if recognized, would impact the effective income tax rate as of the end of the year
$
13,194

 
$
11,095