PENSION AND OTHER POSTRETIREMENT PLANS (Details) (USD $) | 12 Months Ended |
In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | $131,753 | $123,713 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 131,753 | 123,713 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 131,753 | 123,713 | ' |
Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 106,940 | 93,964 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 106,940 | 93,964 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 106,940 | 93,964 | ' |
Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 10,483 | 10,807 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 10,483 | 10,807 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 10,483 | 10,807 | ' |
Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 14,330 | 18,942 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Equity Securities - Stocks [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 35,310 | 36,127 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 35,310 | 36,127 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 35,310 | 36,127 | ' |
Equity Securities - Stocks [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 35,310 | 36,127 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 35,310 | 36,127 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 35,310 | 36,127 | ' |
Equity Securities - Stocks [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Equity Securities - Stocks [Member] | Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Equity Securities - Mutual Funds [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 31,674 | 31,827 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 31,674 | 31,827 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 31,674 | 31,827 | ' |
Equity Securities - Mutual Funds [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 30,694 | 30,507 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 30,694 | 30,507 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 30,694 | 30,507 | ' |
Equity Securities - Mutual Funds [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 980 | 1,320 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 980 | 1,320 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 980 | 1,320 | ' |
Equity Securities - Mutual Funds [Member] | Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Fixed Income Securities [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 29,545 | 27,399 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 29,545 | 27,399 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 29,545 | 27,399 | ' |
Fixed Income Securities [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 20,042 | 17,912 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 20,042 | 17,912 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 20,042 | 17,912 | ' |
Fixed Income Securities [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 9,503 | 9,487 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,503 | 9,487 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,503 | 9,487 | ' |
Fixed Income Securities [Member] | Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Cash and Cash Equivalents [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 14,796 | 9,418 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,796 | 9,418 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,796 | 9,418 | ' |
Cash and Cash Equivalents [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 14,796 | 9,418 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,796 | 9,418 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,796 | 9,418 | ' |
Cash and Cash Equivalents [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Cash and Cash Equivalents [Member] | Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Other Investments [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 20,428 | 18,942 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 20,428 | 18,942 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 20,428 | 18,942 | ' |
Other Investments [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 6,098 | 0 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 6,098 | 0 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 6,098 | 0 | ' |
Other Investments [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 0 | 0 | ' |
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 | ' |
Other Investments [Member] | Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 14,330 | 18,942 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Principal Retirement Plan [Member] | ' | ' | ' |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | 3,000 | ' | ' |
Other postretirement contributions | 0 | ' | ' |
Supplemental Retirement Plan [Member] | ' | ' | ' |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | 725 | ' | ' |
Other postretirement contributions | 0 | ' | ' |
Pension Plans [Member] | ' | ' | ' |
Change in benefit obligation [Roll Forward] | ' | ' | ' |
Benefit obligation, beginning of year | 186,077 | 195,860 | ' |
Acquisitions | 0 | 9,437 | ' |
Service cost | 6,150 | 7,160 | 5,852 |
Interest cost | 8,927 | 8,024 | 7,842 |
Actuarial (gain) loss | 18,412 | -27,179 | ' |
Exchange (gain) loss | -703 | 0 | ' |
Benefit payments | -7,827 | -7,225 | ' |
Benefit obligation, end of year | 211,036 | 186,077 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 123,713 | 116,577 | ' |
Acquisitions | 0 | 9,437 | ' |
Actual return | 10,792 | 10,838 | ' |
Benefit payments | -7,827 | -7,225 | ' |
Employer contributions | 5,075 | 3,523 | ' |
Fair value, end of year | 131,753 | 123,713 | ' |
Funded status | -79,283 | -62,363 | ' |
Unrecognized actuarial loss (gain) | 69,153 | 56,148 | ' |
Unrecognized prior service cost | -1,411 | -1,935 | ' |
Net amount recognized | -11,541 | -8,150 | ' |
Amounts recognized in the consolidated balance sheet: | ' | ' | ' |
Current liability | -733 | -721 | ' |
Noncurrent benefit liability | -78,550 | -61,642 | ' |
Accumulated other comprehensive loss | 67,742 | 54,213 | ' |
Net amount recognized | -11,541 | -8,150 | ' |
Amounts recognized in accumulated other comprehensive loss: | ' | ' | ' |
Net actuarial loss (income) | 69,153 | 56,148 | ' |
Prior service cost | -1,411 | -1,935 | ' |
Net amount recognized | 67,742 | 54,213 | ' |
Accumulated benefit obligations in excess of plan assets [Abstract] | ' | ' | ' |
Accumulated benefit obligation | 180,265 | 156,661 | ' |
Projected benefit obligation | 211,036 | 186,077 | ' |
Net periodic benefit cost [Abstract] | ' | ' | ' |
Service cost | 6,150 | 7,160 | 5,852 |
Interest cost | 8,927 | 8,024 | 7,842 |
Expected return on plan assets | -9,666 | -9,071 | -7,836 |
Amortization: | ' | ' | ' |
Prior service cost | -206 | -206 | -45 |
Net actuarial loss | 3,927 | 7,903 | 6,814 |
Net benefit cost | 9,132 | 13,810 | 12,627 |
Amounts of AOCI expected to be recognized in net periodic benefit costs [Abstract] | ' | ' | ' |
Net actuarial loss | 6,258 | ' | ' |
Prior service cost | -180 | ' | ' |
Weighted-average assumptions [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 4.25% | 5.00% | 4.00% |
Return on plan assets (in hundredths) | 7.75% | 8.00% | 8.00% |
Compensation increase (in hundredths) | 3.50% | 3.50% | 3.50% |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Equity securities | 66,984 | 67,954 | ' |
Fixed income, cash and cash equivalents | 44,341 | 36,817 | ' |
Other investments | 20,428 | 18,942 | ' |
Fair value of plan assets | 131,753 | 123,713 | ' |
Target allocation [Abstract] | ' | ' | ' |
Equity securities (in hundredths) | 55.00% | ' | ' |
Fixed income, cash and cash equivalents (in hundredths) | 30.00% | ' | ' |
Other investments (in hundredths) | 15.00% | ' | ' |
Total target asset allocation (in hundredths) | 100.00% | ' | ' |
Cash included in plan assets (in hundredths) | 2.00% | 2.00% | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 131,753 | 123,713 | ' |
Benefit payments expected to be paid [Abstract] | ' | ' | ' |
2015 | 7,747 | ' | ' |
2016 | 8,116 | ' | ' |
2017 | 8,550 | ' | ' |
2018 | 9,039 | ' | ' |
2019 | 9,611 | ' | ' |
2020-2024 | 57,292 | ' | ' |
Total benefits expected to be paid | 100,355 | ' | ' |
Effect of one-percentage point change in assumed health care cost trend rates [Abstract] | ' | ' | ' |
Withdrawal liability | 30,423 | ' | ' |
Expected annual payments of multi-employer pension obligation | 1,973 | ' | ' |
Pension Plans [Member] | Other Investments [Member] | Level 3 [Member] | ' | ' | ' |
Change in benefit obligation [Roll Forward] | ' | ' | ' |
Acquisitions | 0 | 0 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 18,942 | 18,173 | ' |
Acquisitions | 0 | 0 | ' |
Dispositions | -5,439 | 0 | ' |
Realized Gains (Losses) | 1,118 | 48 | ' |
Unrealized Gains | -291 | 721 | ' |
Fair value, end of year | 14,330 | 18,942 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 14,330 | 18,942 | ' |
Other Postretirement Plans [Member] | ' | ' | ' |
Change in benefit obligation [Roll Forward] | ' | ' | ' |
Benefit obligation, beginning of year | 18,881 | 28,831 | ' |
Acquisitions | 0 | 0 | ' |
Service cost | 436 | 796 | 730 |
Interest cost | 919 | 1,129 | 1,283 |
Actuarial (gain) loss | 1,929 | -11,124 | ' |
Exchange (gain) loss | 0 | 0 | ' |
Benefit payments | -807 | -751 | ' |
Benefit obligation, end of year | 21,358 | 18,881 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 0 | 0 | ' |
Acquisitions | 0 | 0 | ' |
Actual return | 0 | 0 | ' |
Benefit payments | -807 | -751 | ' |
Employer contributions | 807 | 751 | ' |
Fair value, end of year | 0 | 0 | ' |
Funded status | -21,358 | -18,881 | ' |
Unrecognized actuarial loss (gain) | -987 | -3,001 | ' |
Unrecognized prior service cost | -1,306 | -1,502 | ' |
Net amount recognized | -23,651 | -23,384 | ' |
Amounts recognized in the consolidated balance sheet: | ' | ' | ' |
Current liability | -1,007 | -925 | ' |
Noncurrent benefit liability | -20,351 | -17,956 | ' |
Accumulated other comprehensive loss | -2,293 | -4,503 | ' |
Net amount recognized | -23,651 | -23,384 | ' |
Amounts recognized in accumulated other comprehensive loss: | ' | ' | ' |
Net actuarial loss (income) | -987 | -3,001 | ' |
Prior service cost | -1,306 | -1,502 | ' |
Net amount recognized | -2,293 | -4,503 | ' |
Net periodic benefit cost [Abstract] | ' | ' | ' |
Service cost | 436 | 796 | 730 |
Interest cost | 919 | 1,129 | 1,283 |
Expected return on plan assets | 0 | 0 | 0 |
Amortization: | ' | ' | ' |
Prior service cost | -195 | -272 | -451 |
Net actuarial loss | -87 | 439 | 535 |
Net benefit cost | 1,073 | 2,092 | 2,097 |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | 0 | ' | ' |
Other postretirement contributions | 807 | ' | ' |
Amounts of AOCI expected to be recognized in net periodic benefit costs [Abstract] | ' | ' | ' |
Net actuarial loss | 0 | ' | ' |
Prior service cost | -195 | ' | ' |
Weighted-average assumptions [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 4.25% | 5.00% | 4.00% |
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] | ' | ' | ' |
2015 | 1,007 | ' | ' |
2016 | 1,098 | ' | ' |
2017 | 1,205 | ' | ' |
2018 | 1,282 | ' | ' |
2019 | 1,347 | ' | ' |
2020-2024 | 6,847 | ' | ' |
Total benefits expected to be paid | 12,786 | ' | ' |
Assumed health care cost trend rates [Abstract] | ' | ' | ' |
Per capita cost of health care benefits assumed for next fiscal year (in hundredths) | 7.00% | ' | ' |
Ultimate health care cost trend rate (in hundredths) | 4.00% | ' | ' |
Year that rate reaches ultimate trend rate | '2069 | ' | ' |
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 | 1,053 | ' | ' |
Effect of one percentage point increase on service and interest cost components | 71 | ' | ' |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | 926 | ' | ' |
Effect of one percentage point decrease on service and interest cost components | 62 | ' | ' |
Other Retirement Plans [Member] | ' | ' | ' |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | $1,350 | ' | ' |