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Retirement and Post-Retirement Employee Benefit Plans (Table)
12 Months Ended
Sep. 30, 2011
Retirement and PostRetirement Employee Benefit Plans Tables Abstract 
Schedule of Net Periodic Benefit Cost Not yet Recognized Recorded as Regulatory Assets
    Supplemental    
  Defined Executive    
  Benefits Retirement Postretirement  
  Plans Plans Plans Total
  (In thousands)
September 30, 2011           
 Unrecognized transition obligation$ - $ - $ 3,220 $ 3,220
 Unrecognized prior service cost  (373)   -   (8,861)   (9,234)
 Unrecognized actuarial loss  182,486   30,654   47,540   260,680
  $ 182,113 $ 30,654 $ 41,899 $ 254,666
             
September 30, 2010           
 Unrecognized transition obligation$ - $ - $ 4,731 $ 4,731
 Unrecognized prior service cost  (842)   -   (10,311)   (11,153)
 Unrecognized actuarial loss  159,539   30,753   25,694   215,986
  $ 158,697 $ 30,753 $ 20,114 $ 209,564
Schedule of Allocation of Plan Assets
        Actual Allocation
  Targeted September 30
Security Class Allocation Range 2011 2010
             
Domestic equities 35%-55% 40.4% 44.1%
International equities 10%-20% 13.6% 14.4%
Fixed income  10%-30% 21.3% 19.0%
Company stock 5%-15% 13.5% 11.3%
Other assets 5%-15% 11.2% 11.2%
Schedule of Assumptions Used for Employee Pension Plans
 Pension Liability Pension Cost
 2011 2010 2011 2010 2009
               
Discount rate5.05% 5.39% 5.39%(1) 5.52% 7.57%
Rate of compensation increase3.50% 4.00% 4.00% 4.00% 4.00%
Expected return on plan assets7.75% 8.25% 8.25% 8.25% 8.25%
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Employee Pension Plans
   2011 2010
   (In thousands)
        
Accumulated benefit obligation $ 414,489 $ 391,915
        
Change in projected benefit obligation:      
 Benefit obligation at beginning of year $ 407,536 $ 380,045
 Service cost   14,384   13,499
 Interest cost   22,264   20,870
 Actuarial loss   12,944   19,809
 Benefits paid   (27,534)   (26,687)
 Curtailments   (162)   -
 Benefit obligation at end of year   429,432   407,536
        
Change in plan assets:      
 Fair value of plan assets at beginning of year   301,708   301,146
 Actual return on plan assets   5,154   27,249
 Employer contributions   876   -
 Benefits paid   (27,534)   (26,687)
 Fair value of plan assets at end of year   280,204   301,708
        
Reconciliation:      
Funded status   (149,228)   (105,828)
Unrecognized prior service cost   -   -
Unrecognized net loss   -   -
Net amount recognized $ (149,228) $ (105,828)
Components of Net Periodic Pension Cost Table for Employee Pension Plans
    Fiscal Year Ended September 30
    2011 2010 2009
     (In thousands)
Components of net periodic pension cost:         
 Service cost $ 14,384 $ 13,499 $ 12,951
 Interest cost   22,264   20,870   24,060
 Expected return on assets   (24,817)   (25,280)   (24,950)
 Amortization of prior service cost   (429)   (960)   (946)
 Recognized actuarial loss   9,498   9,290   3,742
 Curtailment gain   (40)   -   -
  Net periodic pension cost $ 20,860 $ 17,419 $ 14,857
Schedule of Employee Pension Plans Investments at Fair Value
   Assets at Fair Value as of September 30, 2011
   Level 1 Level 2 Level 3 Total
   (In thousands)
Investments:           
 Common stocks$ 94,336 $ - $ - $ 94,336
 Money market funds  -   9,383   -   9,383
 Registered investment           
  companies  27,236   -   -   27,236
 Common/collective trusts  53,309   -   -   53,309
 Government securities  4,946   18,907   -   23,853
 Corporate bonds  -   33,636   -   33,636
 Limited partnerships  -   37,806   -   37,806
 Real estate  -   -   200   200
Total investments at           
 fair value$ 179,827 $ 99,732 $ 200 $ 279,759

   Assets at Fair Value as of September 30, 2010
   Level 1 Level 2 Level 3 Total
   (In thousands)
Investments:           
 Common stocks$ 116,315 $ - $ - $ 116,315
 Money market funds  -   10,013   -   10,013
 Registered investment           
  companies  32,601   -   -   32,601
 Common/collective trusts  -   48,920   -   48,920
 Government securities  5,548   16,296   -   21,844
 Corporate bonds  -   33,987   -   33,987
 Limited partnerships  -   37,691   -   37,691
 Real estate  -   -   200   200
Total investments at           
 fair value$ 154,464 $ 146,907 $ 200 $ 301,571
Schedule of Assumptions Used for Supplemental Plans
 Pension Liability Pension Cost
 2011 2010 2011 2010 2009
               
Discount rate5.05% 5.39% 5.39% 5.52% 7.57%
Rate of compensation increase3.50% 4.00% 4.00% 4.00% 4.00%
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Supplemental Plans
   2011 2010
    (In thousands)
        
Accumulated benefit obligation $ 104,363 $ 99,673
        
Change in projected benefit obligation:      
 Benefit obligation at beginning of year $ 108,919 $ 102,747
 Service cost   2,768   2,476
 Interest cost   5,825   5,224
 Actuarial loss   2,140   3,043
 Benefits paid   (7,537)   (4,571)
 Benefit obligation at end of year   112,115   108,919
        
Change in plan assets:      
 Fair value of plan assets at beginning of year   -   -
 Employer contribution   7,537   4,571
 Benefits paid   (7,537)   (4,571)
 Fair value of plan assets at end of year   -   -
        
Reconciliation:      
 Funded status   (112,115)   (108,919)
 Unrecognized prior service cost   -   -
 Unrecognized net loss   -   -
 Accrued pension cost $ (112,115) $ (108,919)
Components of Net Periodic Pension Cost Table for Supplemental Plans
    Fiscal Year Ended September 30
  2011 2010 2009
   (In thousands)
Components of net periodic pension cost:         
 Service cost $ 2,768 $ 2,476 $ 1,985
 Interest cost   5,825   5,224   6,056
 Amortization of transition asset   -   -   -
 Amortization of prior service cost   -   187   212
 Recognized actuarial loss    2,239   1,999   324
 Curtailment   -   -   1,645
  Net periodic pension cost $ 10,832 $ 9,886 $ 10,222
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets
  Supplemental Plans
  2011 2010
  (In thousands)
       
Projected Benefit Obligation $ 112,115 $ 108,919
Accumulated Benefit Obligation   104,363   99,673
Fair Value of Plan Assets   -   -
Schedule of Expected Benefit Payments
  Pension Supplemental
  Plans Plans
  (In thousands)
       
2012 $35,286 $25,116
2013  33,109  6,910
2014  31,753  4,738
2015  30,633  6,862
2016  30,648  4,622
2017-2021  146,923  43,625
Schedule of Allocation of Postretirement Benefit Plan Assets
  Actual Allocation
  September 30
Security Class 2011 2010
     
Diversified investment funds 96.8% 97.5%
Cash and cash equivalents 3.2% 2.5%
Schedule of Assumptions Used for Postretirement Benefit Plan
  Postretirement Postretirement
  Liability Cost
  2011 2010 2011 2010 2009
           
Discount rate 5.05% 5.39% 5.39% 5.52% 7.57%
Expected return on plan assets 5.00% 5.00% 5.00% 5.00% 5.00%
Initial trend rate 8.00% 8.00% 8.00% 7.50% 8.00%
Ultimate trend rate 5.00% 5.00% 5.00% 5.00% 5.00%
Ultimate trend reached in 2018 2016 2016 2015 2015
Schedule of Accumulated and Projected Benefit Obligations and Funded Status for Postretirement Benefit Plan
   2011 2010
    (In thousands)
Change in benefit obligation:      
 Benefit obligation at beginning of year $ 228,234 $ 209,732
 Service cost   14,403   13,439
 Interest cost   12,813   12,071
 Plan participants' contributions   2,892   2,734
 Actuarial loss   17,966   2,980
 Benefits paid   (13,046)   (12,722)
 Subsidy payments   432   -
 Benefit obligation at end of year   263,694   228,234
        
Change in plan assets:      
 Fair value of plan assets at beginning of year   53,033   47,646
 Actual return on plan assets   (1,500)   3,551
 Employer contributions   11,254   11,824
 Plan participants' contributions   2,892   2,734
 Benefits paid   (13,046)   (12,722)
 Subsidy payments   432   -
 Fair value of plan assets at end of year   53,065   53,033
        
Reconciliation:      
Funded status   (210,629)   (175,201)
Unrecognized transition obligation   -   -
Unrecognized prior service cost   -   -
Unrecognized net loss   -   -
Accrued postretirement cost $ (210,629) $ (175,201)
Components of Net Periodic Pension Cost Table for Postretirement Benefit Plan
    Fiscal Year Ended
    September 30
    2011 2010 2009
    (In thousands)
Components of net periodic postretirement cost:         
 Service cost $ 14,403 $ 13,439 $ 11,786
 Interest cost   12,813   12,071   14,080
 Expected return on assets   (2,727)   (2,460)   (2,292)
 Amortization of transition obligation   1,511   1,511   1,511
 Amortization of prior service cost   (1,450)   (1,450)   -
 Recognized actuarial loss   347   374   -
  Net periodic postretirement cost $ 24,897 $ 23,485 $ 25,085
Assumed Heath Care Cost Effect on Postretirement Benefit Plan Cost
  One-Percentage One-Percentage
  Point Increase Point Decrease
  (In thousands)
       
Effect on total service and interest cost components $ 4,155 $ (3,479)
Effect on postretirement benefit obligation $ 30,159 $ (25,578)
Schedule of Postretirement Benefit Plans Investments at Fair Value
   Assets at Fair Value as of September 30, 2011
   Level 1 Level 2 Level 3 Total
   (In thousands)
Investments:           
 Money market funds$ - $ 1,707 $ - $ 1,707
 Registered investment           
  companies  51,358   -   -   51,358
Total investments at           
 fair value$ 51,358 $ 1,707 $ - $ 53,065

   Assets at Fair Value as of September 30, 2010
   Level 1 Level 2 Level 3 Total
   (In thousands)
Investments:           
 Money market funds$ - $ 1,307 $ - $ 1,307
 Registered investment           
  companies  51,726   -   -   51,726
Total investments at           
 fair value$ 51,726 $ 1,307 $ - $ 53,033
Schedule of Expected Benefit Payments for Postretirement Benefit Plan
        Total
  Company Retiree Subsidy Postretirement
  Payments Payments Payments Benefits
  (In thousands)
             
2012 $ 31,519 $ 3,293 $ - $ 34,812
2013   13,272   3,895   -   17,167
2014   15,271   4,491   -   19,762
2015   16,789   5,026   -   21,815
2016   18,333   5,672   -   24,005
2017-2021   99,139   38,238   -   137,377