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 contributions |
745
|
|
|
| Other postretirement contributions |
0
|
|
|
Pension Plans [Member] |
|
|
|
| Change in benefit obligation [Roll Forward] |
|
|
|
| Benefit obligation, beginning of year |
145,909
|
138,935
|
|
| Service cost |
5,016
|
4,489
|
3,366
|
| Interest cost |
7,510
|
7,495
|
7,496
|
| Assumption changes |
16,501
|
2,034
|
|
| Actuarial gain |
(887)
|
(1,677)
|
|
| Benefit payments |
(6,016)
|
(5,367)
|
|
| Benefit obligation, end of year |
168,033
|
145,909
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, beginning of year |
94,869
|
84,428
|
|
| Actual return |
1,300
|
6,036
|
|
| Benefit payments |
(6,016)
|
(5,367)
|
|
| Employer contributions |
10,401
|
9,772
|
|
| Fair value, end of year |
100,554
|
94,869
|
|
| Funded status |
(67,480)
|
(51,040)
|
|
| Unrecognized actuarial loss |
85,868
|
68,793
|
|
| Unrecognized prior service cost |
(525)
|
227
|
|
| Net amount recognized |
17,863
|
17,980
|
|
| Amounts recognized in the consolidated balance sheet: |
|
|
|
| Current liability |
(766)
|
(765)
|
|
| Noncurrent benefit liability |
(66,714)
|
(50,275)
|
|
| Accumulated other comprehensive loss |
85,343
|
69,020
|
|
| Net amount recognized |
17,863
|
17,980
|
|
| Amounts recognized in accumulated other comprehensive loss: |
|
|
|
| Net actuarial loss |
85,868
|
68,793
|
|
| Prior service cost |
(525)
|
227
|
|
| Net amount recognized |
85,343
|
69,020
|
|
| Accumulated benefit obligations in excess of plan assets [Abstract] |
|
|
|
| Accumulated benefit obligation |
149,846
|
130,342
|
|
| Projected benefit obligation |
168,033
|
145,909
|
|
| Net periodic benefit cost [Abstract] |
|
|
|
| Service cost |
5,016
|
4,489
|
3,366
|
| Interest cost |
7,510
|
7,495
|
7,496
|
| Expected return on plan assets |
(7,398)
|
(6,982)
|
(7,593)
|
| Amortization: |
|
|
|
| Prior service cost |
26
|
24
|
28
|
| Net actuarial loss |
5,364
|
5,395
|
1,759
|
| Net benefit cost |
10,518
|
10,421
|
5,056
|
| Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract] |
|
|
|
| Net actuarial loss |
6,820
|
|
|
| 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 securities |
50,147
|
49,941
|
|
| Fixed income, cash and cash equivalents |
37,032
|
32,716
|
|
| Other investments |
13,375
|
12,212
|
|
| Fair value of plan assets |
100,554
|
94,869
|
|
| 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 assets |
100,554
|
94,869
|
|
| Benefit payments expected to be paid [Abstract] |
|
|
|
| 2012 |
6,042
|
|
|
| 2013 |
6,365
|
|
|
| 2014 |
6,762
|
|
|
| 2015 |
7,120
|
|
|
| 2016 |
7,599
|
|
|
| 2017-2020 |
45,547
|
|
|
| Total benefits expected to be paid |
79,435
|
|
|
Pension Plans [Member] | Equity Securities - Stocks [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
23,954
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
23,954
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
23,954
|
|
|
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
23,954
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
23,954
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
23,954
|
|
|
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Equity Securities - Stocks [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
26,193
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
26,193
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
26,193
|
|
|
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
26,193
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
26,193
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
26,193
|
|
|
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Equity Securities - Mutual Funds [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Fixed Income Securities [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
21,618
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
21,618
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
21,618
|
|
|
Pension Plans [Member] | Fixed Income Securities [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
7,197
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
7,197
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
7,197
|
|
|
Pension Plans [Member] | Fixed Income Securities [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
14,421
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
14,421
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
14,421
|
|
|
Pension Plans [Member] | Fixed Income Securities [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Cash and Cash Equivalents [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
15,414
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
15,414
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
15,414
|
|
|
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
15,414
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
15,414
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
15,414
|
|
|
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Other Plan Investments [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
13,375
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
Pension Plans [Member] | Other Plan Investments [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Other Plan Investments [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
0
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
|
|
Pension Plans [Member] | Other Plan Investments [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, beginning of year |
12,212
|
|
|
| Acquisitions |
0
|
|
|
| Dispositions |
0
|
|
|
| Realized Losses |
(90)
|
|
|
| Unrealized Gains |
1,073
|
|
|
| Fair value, end of year |
13,375
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
Pension Plans [Member] | Level 1 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
72,758
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
72,758
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
72,758
|
|
|
Pension Plans [Member] | Level 2 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
14,421
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
14,421
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
14,421
|
|
|
Pension Plans [Member] | Level 3 [Member] |
|
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, end of year |
13,375
|
|
|
| Weighted average asset allocation [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
13,375
|
|
|
Other Postretirement Plans [Member] |
|
|
|
| Change in benefit obligation [Roll Forward] |
|
|
|
| Benefit obligation, beginning of year |
24,400
|
25,650
|
|
| Service cost |
632
|
691
|
572
|
| Interest cost |
1,254
|
1,383
|
1,542
|
| Assumption changes |
2,285
|
683
|
|
| Actuarial gain |
(226)
|
(3,214)
|
|
| Benefit payments |
(798)
|
(793)
|
|
| Benefit obligation, end of year |
27,547
|
24,400
|
|
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value, beginning of year |
0
|
0
|
|
| Actual return |
0
|
0
|
|
| Benefit payments |
(798)
|
(793)
|
|
| Employer contributions |
798
|
793
|
|
| Fair value, end of year |
0
|
0
|
|
| Funded status |
(27,547)
|
(24,400)
|
|
| Unrecognized actuarial loss |
8,462
|
6,810
|
|
| 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 loss |
6,855
|
4,727
|
|
| Net amount recognized |
(20,692)
|
(19,673)
|
|
| Amounts recognized in accumulated other comprehensive loss: |
|
|
|
| Net actuarial loss |
8,462
|
6,810
|
|
| Prior service cost |
(1,607)
|
(2,083)
|
|
| Net amount recognized |
6,855
|
4,727
|
|
| Net periodic benefit cost [Abstract] |
|
|
|
| Service cost |
632
|
691
|
572
|
| Interest cost |
1,254
|
1,383
|
1,542
|
| Expected return on plan assets |
0
|
0
|
0
|
| Amortization: |
|
|
|
| Prior service cost |
(476)
|
(726)
|
(1,297)
|
| Net actuarial loss |
407
|
521
|
294
|
| Net benefit cost |
1,817
|
1,869
|
1,111
|
| Contributions during fiscal 2011: |
|
|
|
| Pension contributions |
0
|
|
|
| Other postretirement contributions |
798
|
|
|
| Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract] |
|
|
|
| Net actuarial loss |
535
|
|
|
| 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 assets |
0
|
0
|
|
| Fair value of plan assets [Abstract] |
|
|
|
| Fair value of plan assets |
0
|
0
|
|
| Benefit payments expected to be paid [Abstract] |
|
|
|
| 2012 |
1,130
|
|
|
| 2013 |
1,240
|
|
|
| 2014 |
1,363
|
|
|
| 2015 |
1,454
|
|
|
| 2016 |
1,519
|
|
|
| 2017-2020 |
9,657
|
|
|
| Total benefits expected to be paid |
16,363
|
|
|
| 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 rate |
2030
|
|
|
| Effect of one-percentage point change in assumed health care cost trend rates [Abstract] |
|
|
|
| Effect of one percentage point increase on accumulated postretirement benefit obligation |
1,384
|
|
|
| Effect of one percentage point increase on service and interest cost components |
114
|
|
|
| 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)
|
|
|