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PENSION AND OTHER POSTRETIREMENT PLANS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Principal Retirement Plan [Member]
   
Contributions during fiscal 2011:   
Pension contributions$ 9,000  
Supplemental Retirement Plan [Member]
   
Contributions during fiscal 2011:   
Pension contributions745  
Other postretirement contributions0  
Pension Plans [Member]
   
Change in benefit obligation [Roll Forward]   
Benefit obligation, beginning of year145,909138,935 
Service cost5,0164,4893,366
Interest cost7,5107,4957,496
Assumption changes16,5012,034 
Actuarial gain(887)(1,677) 
Benefit payments(6,016)(5,367) 
Benefit obligation, end of year168,033145,909 
Change in plan assets [Roll Forward]   
Fair value, beginning of year94,86984,428 
Actual return1,3006,036 
Benefit payments(6,016)(5,367) 
Employer contributions10,4019,772 
Fair value, end of year100,55494,869 
Funded status(67,480)(51,040) 
Unrecognized actuarial loss85,86868,793 
Unrecognized prior service cost(525)227 
Net amount recognized17,86317,980 
Amounts recognized in the consolidated balance sheet:   
Current liability(766)(765) 
Noncurrent benefit liability(66,714)(50,275) 
Accumulated other comprehensive loss85,34369,020 
Net amount recognized17,86317,980 
Amounts recognized in accumulated other comprehensive loss:   
Net actuarial loss85,86868,793 
Prior service cost(525)227 
Net amount recognized85,34369,020 
Accumulated benefit obligations in excess of plan assets [Abstract]   
Accumulated benefit obligation149,846130,342 
Projected benefit obligation168,033145,909 
Net periodic benefit cost [Abstract]   
Service cost5,0164,4893,366
Interest cost7,5107,4957,496
Expected return on plan assets(7,398)(6,982)(7,593)
Amortization:   
Prior service cost262428
Net actuarial loss5,3645,3951,759
Net benefit cost10,51810,4215,056
Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract]   
Net actuarial loss6,820  
Prior service cost(45)  
Weighted-average assumptions [Abstract]   
Discount rate (in hundredths)4.75%5.25%5.50%
Return on plan assets (in hundredths)8.00%8.00%8.50%
Compensation increase (in hundredths)3.50%3.50%4.25%
Weighted average asset allocation [Abstract]   
Equity securities50,14749,941 
Fixed income, cash and cash equivalents37,03232,716 
Other investments13,37512,212 
Fair value of plan assets100,55494,869 
Target allocation [Abstract]   
Equity securities (in hundredths)50.00%50.00% 
Fixed income, cash and cash equivalents (in hundredths)30.00%30.00% 
Other investments (in hundredths)20.00%20.00% 
Total target asset allocation (in hundredths)100.00%100.00% 
Cash included in plan assets (in hundredths)9.00%10.00% 
Fair value of plan assets [Abstract]   
Fair value of plan assets100,55494,869 
Benefit payments expected to be paid [Abstract]   
20126,042  
20136,365  
20146,762  
20157,120  
20167,599  
2017-202045,547  
Total benefits expected to be paid79,435  
Pension Plans [Member] | Equity Securities - Stocks [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year23,954  
Weighted average asset allocation [Abstract]   
Fair value of plan assets23,954  
Fair value of plan assets [Abstract]   
Fair value of plan assets23,954  
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year23,954  
Weighted average asset allocation [Abstract]   
Fair value of plan assets23,954  
Fair value of plan assets [Abstract]   
Fair value of plan assets23,954  
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Equity Securities - Mutual Funds [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year26,193  
Weighted average asset allocation [Abstract]   
Fair value of plan assets26,193  
Fair value of plan assets [Abstract]   
Fair value of plan assets26,193  
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year26,193  
Weighted average asset allocation [Abstract]   
Fair value of plan assets26,193  
Fair value of plan assets [Abstract]   
Fair value of plan assets26,193  
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Fixed Income Securities [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year21,618  
Weighted average asset allocation [Abstract]   
Fair value of plan assets21,618  
Fair value of plan assets [Abstract]   
Fair value of plan assets21,618  
Pension Plans [Member] | Fixed Income Securities [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year7,197  
Weighted average asset allocation [Abstract]   
Fair value of plan assets7,197  
Fair value of plan assets [Abstract]   
Fair value of plan assets7,197  
Pension Plans [Member] | Fixed Income Securities [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year14,421  
Weighted average asset allocation [Abstract]   
Fair value of plan assets14,421  
Fair value of plan assets [Abstract]   
Fair value of plan assets14,421  
Pension Plans [Member] | Fixed Income Securities [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Cash and Cash Equivalents [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year15,414  
Weighted average asset allocation [Abstract]   
Fair value of plan assets15,414  
Fair value of plan assets [Abstract]   
Fair value of plan assets15,414  
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year15,414  
Weighted average asset allocation [Abstract]   
Fair value of plan assets15,414  
Fair value of plan assets [Abstract]   
Fair value of plan assets15,414  
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Other Plan Investments [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year13,375  
Weighted average asset allocation [Abstract]   
Fair value of plan assets13,375  
Fair value of plan assets [Abstract]   
Fair value of plan assets13,375  
Pension Plans [Member] | Other Plan Investments [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Other Plan Investments [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year0  
Weighted average asset allocation [Abstract]   
Fair value of plan assets0  
Fair value of plan assets [Abstract]   
Fair value of plan assets0  
Pension Plans [Member] | Other Plan Investments [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, beginning of year12,212  
Acquisitions0  
Dispositions0  
Realized Losses(90)  
Unrealized Gains1,073  
Fair value, end of year13,375  
Weighted average asset allocation [Abstract]   
Fair value of plan assets13,375  
Fair value of plan assets [Abstract]   
Fair value of plan assets13,375  
Pension Plans [Member] | Level 1 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year72,758  
Weighted average asset allocation [Abstract]   
Fair value of plan assets72,758  
Fair value of plan assets [Abstract]   
Fair value of plan assets72,758  
Pension Plans [Member] | Level 2 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year14,421  
Weighted average asset allocation [Abstract]   
Fair value of plan assets14,421  
Fair value of plan assets [Abstract]   
Fair value of plan assets14,421  
Pension Plans [Member] | Level 3 [Member]
   
Change in plan assets [Roll Forward]   
Fair value, end of year13,375  
Weighted average asset allocation [Abstract]   
Fair value of plan assets13,375  
Fair value of plan assets [Abstract]   
Fair value of plan assets13,375  
Other Postretirement Plans [Member]
   
Change in benefit obligation [Roll Forward]   
Benefit obligation, beginning of year24,40025,650 
Service cost632691572
Interest cost1,2541,3831,542
Assumption changes2,285683 
Actuarial gain(226)(3,214) 
Benefit payments(798)(793) 
Benefit obligation, end of year27,54724,400 
Change in plan assets [Roll Forward]   
Fair value, beginning of year00 
Actual return00 
Benefit payments(798)(793) 
Employer contributions798793 
Fair value, end of year00 
Funded status(27,547)(24,400) 
Unrecognized actuarial loss8,4626,810 
Unrecognized prior service cost(1,607)(2,083) 
Net amount recognized(20,692)(19,673) 
Amounts recognized in the consolidated balance sheet:   
Current liability(1,130)(1,093) 
Noncurrent benefit liability(26,417)(23,307) 
Accumulated other comprehensive loss6,8554,727 
Net amount recognized(20,692)(19,673) 
Amounts recognized in accumulated other comprehensive loss:   
Net actuarial loss8,4626,810 
Prior service cost(1,607)(2,083) 
Net amount recognized6,8554,727 
Net periodic benefit cost [Abstract]   
Service cost632691572
Interest cost1,2541,3831,542
Expected return on plan assets000
Amortization:   
Prior service cost(476)(726)(1,297)
Net actuarial loss407521294
Net benefit cost1,8171,8691,111
Contributions during fiscal 2011:   
Pension contributions0  
Other postretirement contributions798  
Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract]   
Net actuarial loss535  
Prior service cost(451)  
Weighted-average assumptions [Abstract]   
Discount rate (in hundredths)4.75%5.25%5.50%
Return on plan assets (in hundredths)0.00%0.00%0.00%
Compensation increase (in hundredths)0.00%0.00%0.00%
Weighted average asset allocation [Abstract]   
Fair value of plan assets00 
Fair value of plan assets [Abstract]   
Fair value of plan assets00 
Benefit payments expected to be paid [Abstract]   
20121,130  
20131,240  
20141,363  
20151,454  
20161,519  
2017-20209,657  
Total benefits expected to be paid16,363  
Assumed health care cost trend rates [Abstract]   
Per capita cost of health care benefits assumed for next fiscal year (in hundredths)9.00%  
Ultimate health care cost trend rate (in hundredths)5.00%  
Year that rate reaches ultimate trend rate2030  
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]   
Effect of one percentage point increase on accumulated postretirement benefit obligation1,384  
Effect of one percentage point increase on service and interest cost components114  
Effect of one percentage point decrease on accumulated postretirement benefit obligation(1,226)  
Effect of one percentage point decrease on service and interest cost components$ (100)