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Retirement and Post-Retirement Employee Benefit Plans (Table)
 12 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost Not Yet Recognized And Recorded as Regulatory Assets
The amounts that have not yet been recognized in net periodic pension cost that have been recorded as regulatory assets are as follows:
 
Defined
Benefits Plans
 
Supplemental
Executive
Retirement Plans
 
Postretirement
Plans
 
Total
 
(In thousands)
September 30, 2013
 
 
 
 
 
 
 
Unrecognized transition obligation
$
—

 
$
—

 
$
628

 
$
628

Unrecognized prior service credit
(91
)
 
—

 
(5,961
)
 
(6,052
)
Unrecognized actuarial loss
108,621

 
31,466

 
35,961

 
176,048

 
$
108,530

 
$
31,466

 
$
30,628

 
$
170,624

September 30, 2012
 
 
 
 
 
 
 
Unrecognized transition obligation
$
—

 
$
—

 
$
1,709

 
$
1,709

Unrecognized prior service credit
(232
)
 
—

 
(7,411
)
 
(7,643
)
Unrecognized actuarial loss
187,050

 
43,995

 
63,402

 
294,447

 
$
186,818

 
$
43,995

 
$
57,700

 
$
288,513
Schedule of Allocation of Plan Assets
The following table presents asset allocation information for the Master Trust as of September 30, 2013 and 2012.
 
Targeted
Allocation  Range
 
Actual
Allocation
September 30
Security Class
2013
 
2012
Domestic equities
35%-55%
 
46.5
%
 
42.6
%
International equities
10%-20%
 
16.1
%
 
13.9
%
Fixed income
10%-30%
 
14.9
%
 
18.6
%
Company stock
5%-15%
 
12.6
%
 
12.0
%
Other assets
5%-15%
 
9.9
%
 
12.9
%
Schedule of Assumptions Used for Employee Pension Plans
These assumptions are presented in the following table:
 
Pension
Liability
 
Pension Cost
 
2013
 
2012
 
2013
 
2012
 
2011
 
Discount rate
4.95
%
 
4.04
%
 
4.04
%
 
5.05
%
 
5.39
%
(1) 
Rate of compensation increase
3.50
%
 
3.50
%
 
3.50
%
 
3.50
%
 
4.00
%
 
Expected return on plan assets
7.25
%
 
7.75
%
 
7.75
%
 
7.75
%
 
8.25
%
 

 
(1) 
The discount rate for the Pension Account Plan increased from 5.39% to 5.68% effective January 1, 2011 due to a curtailment gain recorded in fiscal 2011.
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Employee Pension Plans
The following table presents the Plans’ accumulated benefit obligation, projected benefit obligation and funded status as of September 30, 2013 and 2012:
 
2013
 
2012
 
(In thousands)
Accumulated benefit obligation
$
446,133

 
$
468,440

Change in projected benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
480,031

 
$
429,432

Service cost
17,754

 
15,084

Interest cost
19,334

 
21,568

Actuarial (gain) loss
(29,822
)
 
46,197

Benefits paid
(25,073
)
 
(24,553
)
Divestitures
(6,425
)
 
(7,697
)
Benefit obligation at end of year
455,799

 
480,031

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
343,144

 
280,204

Actual return on plan assets
52,496

 
48,656

Employer contributions
32,745

 
46,534

Benefits paid
(25,073
)
 
(24,553
)
Divestitures
(6,425
)
 
(7,697
)
Fair value of plan assets at end of year
396,887

 
343,144

Reconciliation:
 
 
 
Funded status
(58,912
)
 
(136,887
)
Unrecognized prior service cost
—

 
—

Unrecognized net loss
—

 
—

Net amount recognized
$
(58,912
)
 
$
(136,887
)
Components of Net Periodic Pension Cost Table for Employee Pension Plans
Net periodic pension cost for the Plans for fiscal 2013, 2012 and 2011 is recorded as operating expense and included the following components:
 
Fiscal Year Ended September 30
 
2013
 
2012
 
2011
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
Service cost
$
17,754

 
$
15,084

 
$
14,384

Interest cost
19,334

 
21,568

 
22,264

Expected return on assets
(22,955
)
 
(21,474
)
 
(24,817
)
Amortization of prior service credit
(141
)
 
(141
)
 
(429
)
Recognized actuarial loss
19,066

 
14,451

 
9,498

Curtailment gain
—

 
—

 
(40
)
Net periodic pension cost
$
33,058

 
$
29,488

 
$
20,860
Schedule of Employee Pension Plans Investments at Fair Value
In addition to the assets shown below, the Master Trust had net accounts receivable of $0.4 million and $0.5 million at September 30, 2013 and 2012 which materially approximates fair value due to the short-term nature of these assets.
 
Assets at Fair Value as of September 30, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In thousands)
Investments:
 
 
 
 
 
 
 
Common stocks — domestic equities
$
143,543

 
$
—

 
$
—

 
$
143,543

Money market funds
—

 
12,266

 
—

 
12,266

Registered investment companies:
 
 
 
 
 
 
 
Domestic funds
30,200

 
—

 
—

 
30,200

International funds
47,036

 
—

 
—

 
47,036

Common/collective trusts — domestic funds
—

 
57,627

 
—

 
57,627

Government securities:
 
 
 
 
 
 
 
Mortgage-backed securities
—

 
18,446

 
—

 
18,446

U.S. treasuries
4,117

 
663

 
—

 
4,780

Corporate bonds
—

 
35,012

 
—

 
35,012

Limited partnerships
—

 
47,417

 
—

 
47,417

Real estate
—

 
—

 
155

 
155

Total investments at fair value
$
224,896

 
$
171,431

 
$
155

 
$
396,482


 
Assets at Fair Value as of September 30, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In thousands)
Investments:
 
 
 
 
 
 
 
Common stocks — domestic equities
$
114,799

 
$
—

 
$
—

 
$
114,799

Money market funds
—

 
21,010

 
—

 
21,010

Registered investment companies:
 
 
 
 
 
 
 
Domestic funds
19,984

 
—

 
—

 
19,984

International funds
36,714

 
—

 
—

 
36,714

Common/collective trusts — domestic funds
—

 
52,155

 
—

 
52,155

Government securities
 
 
 
 
 
 
 
Mortgage-backed securities
—

 
19,509

 
—

 
19,509

U.S. treasuries
7,597

 
487

 
—

 
8,084

Corporate bonds
—

 
35,960

 
—

 
35,960

Limited partnerships
140

 
41,786

 
—

 
41,926

Real estate
—

 
—

 
155

 
155

Total investments at fair value
$
179,234

 
$
170,907

 
$
155

 
$
350,296
Schedule of Assumptions Used for Supplemental Plans
The actuarial assumptions used to determine the pension liability for the supplemental plans were determined as of September 30, 2013 and 2012 and the actuarial assumptions used to determine the net periodic pension cost for the supplemental plans were determined as of September 30, 2012, 2011 and 2010. These assumptions are presented in the following table:
 
Pension
Liability
 
Pension Cost
 
2013
 
2012
 
2013
 
 
2012
 
2011
Discount rate
4.95
%
 
4.04
%
 
4.04
%
(1) 
 
5.05
%
 
5.39
%
Rate of compensation increase
3.50
%
 
3.50
%
 
3.50
%
 
 
3.50
%
 
4.00
%

 
(1)
The discount rate for the supplemental plans increased from 4.04% to 4.21% effective April 1, 2013 due to a settlement loss recorded in fiscal 2013.
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Supplemental Plans
The following table presents the supplemental plans’ accumulated benefit obligation, projected benefit obligation and funded status as of September 30, 2013 and 2012:
 
2013
 
2012
 
(In thousands)
Accumulated benefit obligation
$
109,817

 
$
121,815

Change in projected benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
130,186

 
$
112,115

Service cost
3,039

 
2,108

Interest cost
4,755

 
5,142

Actuarial (gain) loss
(6,451
)
 
15,459

Benefits paid
(4,375
)
 
(4,638
)
Settlements
(10,074
)
 
—

Benefit obligation at end of year
117,080

 
130,186

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
—

 
—

Employer contribution
14,449

 
4,638

Benefits paid
(4,375
)
 
(4,638
)
Settlements
(10,074
)
 
—

Fair value of plan assets at end of year
—

 
—

Reconciliation:
 
 
 
Funded status
(117,080
)
 
(130,186
)
Unrecognized prior service cost
—

 
—

Unrecognized net loss
—

 
—

Accrued pension cost
$
(117,080
)
 
$
(130,186
)
Components of Net Periodic Pension Cost Table for Supplemental Plans
Net periodic pension cost for the supplemental plans for fiscal 2013, 2012 and 2011 is recorded as operating expense and included the following components:
 
Fiscal Year Ended September 30
 
2013
 
2012
 
2011
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
Service cost
$
3,039

 
$
2,108

 
$
2,768

Interest cost
4,755

 
5,142

 
5,825

Amortization of transition asset
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

Recognized actuarial loss
2,918

 
2,118

 
2,239

Settlements
3,160

 
—

 
—

Net periodic pension cost
$
13,872

 
$
9,368

 
$
10,832
Schedule of Expected Benefit Payments
The following benefit payments for our defined benefit plans, which reflect expected future service, as appropriate, are expected to be paid in the following fiscal years:
 
Pension
Plans
 
Supplemental
Plans
 
(In thousands)
2014
$
40,640

 
$
22,940

2015
36,230

 
6,363

2016
34,752

 
6,226

2017
33,612

 
6,440

2018
33,273

 
6,913

2019-2023
156,367

 
34,260
Schedule of Allocation of Postretirement Benefit Plan Assets
The following table presents asset allocation information for the postretirement benefit plan assets as of September 30, 2013 and 2012.
 
Actual
Allocation
September 30
Security Class
2013
 
2012
Diversified investment funds
96.8
%
 
97.0
%
Cash and cash equivalents
3.2
%
 
3.0
%
Schedule of Assumptions Used for Postretirement Benefit Plan
The actuarial assumptions used to determine the pension liability for our postretirement plan were determined as of September 30, 2013 and 2012 and the actuarial assumptions used to determine the net periodic pension cost for the postretirement plan were determined as of September 30, 2012, 2011 and 2010. The assumptions are presented in the following table:
 
Postretirement
Liability
 
Postretirement Cost
 
2013
 
2012
 
2013
 
2012
 
2011
Discount rate
4.95
%
 
4.04
%
 
4.04
%
 
5.05
%
 
5.39
%
Expected return on plan assets
4.60
%
 
4.70
%
 
4.70
%
 
5.00
%
 
5.00
%
Initial trend rate
8.00
%
 
8.00
%
 
8.00
%
 
8.00
%
 
8.00
%
Ultimate trend rate
5.00
%
 
5.00
%
 
5.00
%
 
5.00
%
 
5.00
%
Ultimate trend reached in
2020

 
2019

 
2019

 
2018

 
2016
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Postretirement Benefit Plan
The following table presents the postretirement plan’s benefit obligation and funded status as of September 30, 2013 and 2012:
 
2013
 
2012
 
(In thousands)
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
308,315

 
$
263,694

Service cost
18,800

 
16,353

Interest cost
12,964

 
13,861

Plan participants’ contributions
3,815

 
3,649

Actuarial (gain) loss
(13,801
)
 
28,815

Benefits paid
(14,458
)
 
(13,197
)
Divestitures
(3,487
)
 
(4,860
)
Benefit obligation at end of year
312,148

 
308,315

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
77,072

 
53,065

Actual return on plan assets
13,432

 
12,912

Employer contributions
26,552

 
22,139

Plan participants’ contributions
3,815

 
3,649

Benefits paid
(14,458
)
 
(13,197
)
Divestitures
—

 
(1,496
)
Fair value of plan assets at end of year
106,413

 
77,072

Reconciliation:
 
 
 
Funded status
(205,735
)
 
(231,243
)
Unrecognized transition obligation
—

 
—

Unrecognized prior service cost
—

 
—

Unrecognized net loss
—

 
—

Accrued postretirement cost
$
(205,735
)
 
$
(231,243
)
Components of Net Periodic Pension Cost Table for Postretirement Benefit Plan
Net periodic postretirement cost for fiscal 2013, 2012 and 2011 is recorded as operating expense and included the components presented below.
 
Fiscal Year Ended September 30
 
2013
 
2012
 
2011
 
(In thousands)
Components of net periodic postretirement cost:
 
 
 
 
 
Service cost
$
18,800

 
$
16,353

 
$
14,403

Interest cost
12,964

 
13,861

 
12,813

Expected return on assets
(3,988
)
 
(2,607
)
 
(2,727
)
Amortization of transition obligation
1,081

 
1,511

 
1,511

Amortization of prior service credit
(1,450
)
 
(1,450
)
 
(1,450
)
Recognized actuarial loss
4,196

 
2,648

 
347

Net periodic postretirement cost
$
31,603

 
$
30,316

 
$
24,897
Assumed Heath Care Cost Effect on Postretirement Benefit Plan Cost
Assumed health care cost trend rates have a significant effect on the amounts reported for the plan. A one-percentage point change in assumed health care cost trend rates would have the following effects on the latest actuarial calculations:
 
One-Percentage
Point Increase
 
One-Percentage
Point Decrease
 
(In thousands)
Effect on total service and interest cost components
$
4,399

 
$
(3,682
)
Effect on postretirement benefit obligation
$
36,680

 
$
(30,940
)
Schedule of Postretirement Benefit Plans Investments at Fair Value
 
Assets at Fair Value as of September 30, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In thousands)
Investments:
 
 
 
 
 
 
 
Money market funds
$
—

 
$
3,356

 
$
—

 
$
3,356

Registered investment companies:
 
 
 
 
 
 
 
Domestic funds
9,614

 
—

 
—

 
9,614

International funds
93,443

 
—

 
—

 
93,443

Total investments at fair value
$
103,057

 
$
3,356

 
$
—

 
$
106,413

 
 
Assets at Fair Value as of September 30, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In thousands)
Investments:
 
 
 
 
 
 
 
Money market funds
$
—

 
$
2,360

 
$
—

 
$
2,360

Registered investment companies:
 
 
 
 
 
 
 
Domestic funds
7,756

 
—

 
—

 
7,756

International funds
68,452

 
—

 
—

 
68,452

Total investments at fair value
$
76,208

 
$
2,360

 
$
—

 
$
78,568
Schedule of Expected Benefit Payments for Postretirement Benefit Plan
The following benefit payments paid by us, retirees and prescription drug subsidy payments for our postretirement benefit plans, which reflect expected future service, as appropriate, are expected to be paid in the following fiscal years:
 
Company
Payments
 
Retiree
Payments
 
Subsidy
Payments
 
Total
Postretirement
Benefits
 
(In thousands)
2014
$
25,547

 
$
3,899

 
$
—

 
$
29,446

2015
16,628

 
4,915

 
—

 
21,543

2016
19,260

 
6,049

 
—

 
25,309

2017
21,216

 
7,304

 
—

 
28,520

2018
22,550

 
8,677

 
—

 
31,227

2019-2023
116,617

 
58,595

 
—

 
175,212