PENSION AND OTHER POSTRETIREMENT PLANS (Details) (USD $) | 12 Months Ended |
In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | $123,713 | $116,577 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 123,713 | 116,577 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 123,713 | 116,577 | ' |
Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 93,964 | 85,697 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 93,964 | 85,697 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 93,964 | 85,697 | ' |
Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 10,807 | 12,707 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 10,807 | 12,707 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 10,807 | 12,707 | ' |
Level 3 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 18,942 | 18,173 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Equity Securities - Stocks [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 36,127 | 34,127 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 36,127 | 34,127 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 36,127 | 34,127 | ' |
Equity Securities - Stocks [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 36,127 | 34,127 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 36,127 | 34,127 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 36,127 | 34,127 | ' |
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 | 31,827 | 29,059 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 31,827 | 29,059 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 31,827 | 29,059 | ' |
Equity Securities - Mutual Funds [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 30,507 | 29,059 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 30,507 | 29,059 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 30,507 | 29,059 | ' |
Equity Securities - Mutual Funds [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 1,320 | 0 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 1,320 | 0 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 1,320 | 0 | ' |
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 | 27,399 | 23,230 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 27,399 | 23,230 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 27,399 | 23,230 | ' |
Fixed Income Securities [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 17,912 | 10,523 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 17,912 | 10,523 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 17,912 | 10,523 | ' |
Fixed Income Securities [Member] | Level 2 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 9,487 | 12,707 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,487 | 12,707 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,487 | 12,707 | ' |
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 | 9,418 | 11,988 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,418 | 11,988 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,418 | 11,988 | ' |
Cash and Cash Equivalents [Member] | Level 1 [Member] | ' | ' | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, end of year | 9,418 | 11,988 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,418 | 11,988 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 9,418 | 11,988 | ' |
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 | 18,942 | 18,173 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Other Investments [Member] | Level 1 [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 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 | 18,942 | 18,173 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Principal Retirement Plan [Member] | ' | ' | ' |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | 2,500 | ' | ' |
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 | 195,860 | 168,033 | ' |
Acquisitions | 9,437 | 0 | ' |
Service cost | 7,160 | 5,852 | 5,016 |
Interest cost | 8,024 | 7,842 | 7,510 |
Assumption changes | -26,288 | 19,701 | ' |
Actuarial (gain) loss | -891 | 688 | ' |
Benefit payments | -7,225 | -6,256 | ' |
Benefit obligation, end of year | 186,077 | 195,860 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 116,577 | 100,554 | ' |
Acquisitions | 9,437 | 0 | ' |
Actual return | 10,838 | 16,000 | ' |
Benefit payments | -7,225 | -6,256 | ' |
Employer contributions | 3,523 | 6,279 | ' |
Fair value, end of year | 123,713 | 116,577 | ' |
Funded status | -62,363 | -79,283 | ' |
Unrecognized actuarial loss (gain) | 56,148 | 92,940 | ' |
Unrecognized prior service cost | -1,935 | -2,142 | ' |
Net amount recognized | -8,150 | 11,515 | ' |
Amounts recognized in the consolidated balance sheet: | ' | ' | ' |
Current liability | -721 | -720 | ' |
Noncurrent benefit liability | -61,642 | -78,563 | ' |
Accumulated other comprehensive loss (income) | 54,213 | 90,798 | ' |
Net amount recognized | -8,150 | 11,515 | ' |
Amounts recognized in accumulated other comprehensive loss: | ' | ' | ' |
Net actuarial loss | 56,148 | 92,940 | ' |
Prior service cost | -1,935 | -2,142 | ' |
Net amount recognized | 54,213 | 90,798 | ' |
Accumulated benefit obligations in excess of plan assets [Abstract] | ' | ' | ' |
Accumulated benefit obligation | 156,661 | 172,142 | ' |
Projected benefit obligation | 186,077 | 195,860 | ' |
Net periodic benefit cost [Abstract] | ' | ' | ' |
Service cost | 7,160 | 5,852 | 5,016 |
Interest cost | 8,024 | 7,842 | 7,510 |
Expected return on plan assets | -9,071 | -7,836 | -7,398 |
Amortization: | ' | ' | ' |
Prior service cost | -206 | -45 | 26 |
Net actuarial loss | 7,903 | 6,814 | 5,364 |
Net benefit cost | 13,810 | 12,627 | 10,518 |
Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract] | ' | ' | ' |
Net actuarial loss | 3,964 | ' | ' |
Prior service cost | -206 | ' | ' |
Weighted-average assumptions [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 5.00% | 4.00% | 4.75% |
Return on plan assets (in hundredths) | 8.00% | 8.00% | 8.00% |
Compensation increase (in hundredths) | 3.50% | 3.50% | 3.50% |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Equity securities | 67,954 | 63,186 | ' |
Fixed income, cash and cash equivalents | 36,817 | 35,218 | ' |
Other investments | 18,942 | 18,173 | ' |
Fair value of plan assets | 123,713 | 116,577 | ' |
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% | 4.00% | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 123,713 | 116,577 | ' |
Benefit payments expected to be paid [Abstract] | ' | ' | ' |
2014 | 7,080 | ' | ' |
2015 | 7,722 | ' | ' |
2016 | 8,190 | ' | ' |
2017 | 8,550 | ' | ' |
2018 | 9,063 | ' | ' |
2019-2023 | 53,709 | ' | ' |
Total benefits expected to be paid | 94,314 | ' | ' |
Pension Plans [Member] | Other Investments [Member] | Level 3 [Member] | ' | ' | ' |
Change in benefit obligation [Roll Forward] | ' | ' | ' |
Acquisitions | 0 | 3,800 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 18,173 | 13,375 | ' |
Acquisitions | 0 | 3,800 | ' |
Dispositions | 0 | 0 | ' |
Realized Gains (Losses) | 48 | 766 | ' |
Unrealized Gains | 721 | 232 | ' |
Fair value, end of year | 18,942 | 18,173 | ' |
Weighted average asset allocation [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Fair value of plan assets [Abstract] | ' | ' | ' |
Fair value of plan assets | 18,942 | 18,173 | ' |
Other Postretirement Plans [Member] | ' | ' | ' |
Change in benefit obligation [Roll Forward] | ' | ' | ' |
Benefit obligation, beginning of year | 28,831 | 27,547 | ' |
Acquisitions | 0 | 0 | ' |
Service cost | 796 | 730 | 632 |
Interest cost | 1,129 | 1,283 | 1,254 |
Assumption changes | -10,270 | 2,508 | ' |
Actuarial (gain) loss | -854 | -2,473 | ' |
Benefit payments | -751 | -764 | ' |
Benefit obligation, end of year | 18,881 | 28,831 | ' |
Change in plan assets [Roll Forward] | ' | ' | ' |
Fair value, beginning of year | 0 | 0 | ' |
Acquisitions | 0 | 0 | ' |
Actual return | 0 | 0 | ' |
Benefit payments | -751 | -764 | ' |
Employer contributions | 751 | 764 | ' |
Fair value, end of year | 0 | 0 | ' |
Funded status | -18,881 | -28,831 | ' |
Unrecognized actuarial loss (gain) | -3,001 | 8,561 | ' |
Unrecognized prior service cost | -1,502 | -1,774 | ' |
Net amount recognized | -23,384 | -22,044 | ' |
Amounts recognized in the consolidated balance sheet: | ' | ' | ' |
Current liability | -925 | -1,106 | ' |
Noncurrent benefit liability | -17,956 | -27,725 | ' |
Accumulated other comprehensive loss (income) | -4,503 | 6,787 | ' |
Net amount recognized | -23,384 | -22,044 | ' |
Amounts recognized in accumulated other comprehensive loss: | ' | ' | ' |
Net actuarial loss | -3,001 | 8,561 | ' |
Prior service cost | -1,502 | -1,774 | ' |
Net amount recognized | -4,503 | 6,787 | ' |
Net periodic benefit cost [Abstract] | ' | ' | ' |
Service cost | 796 | 730 | 632 |
Interest cost | 1,129 | 1,283 | 1,254 |
Expected return on plan assets | 0 | 0 | 0 |
Amortization: | ' | ' | ' |
Prior service cost | -272 | -451 | -476 |
Net actuarial loss | 439 | 535 | 407 |
Net benefit cost | 2,092 | 2,097 | 1,817 |
Contributions during fiscal 2013: | ' | ' | ' |
Pension contributions | 0 | ' | ' |
Other postretirement contributions | 751 | ' | ' |
Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract] | ' | ' | ' |
Net actuarial loss | -87 | ' | ' |
Prior service cost | -195 | ' | ' |
Weighted-average assumptions [Abstract] | ' | ' | ' |
Discount rate (in hundredths) | 5.00% | 4.00% | 4.75% |
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] | ' | ' | ' |
2014 | 926 | ' | ' |
2015 | 917 | ' | ' |
2016 | 1,004 | ' | ' |
2017 | 1,126 | ' | ' |
2018 | 1,186 | ' | ' |
2019-2023 | 6,275 | ' | ' |
Total benefits expected to be paid | 11,434 | ' | ' |
Assumed health care cost trend rates [Abstract] | ' | ' | ' |
Per capita cost of health care benefits assumed for next fiscal year (in hundredths) | 8.00% | ' | ' |
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 | 967 | ' | ' |
Effect of one percentage point increase on service and interest cost components | 107 | ' | ' |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | 846 | ' | ' |
Effect of one percentage point decrease on service and interest cost components | $94 | ' | ' |