PENSION AND OTHER POSTRETIREMENT PLANS (Details) - USD ($) | 3 Months Ended | 12 Months Ended | | |
Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2015 | Sep. 30, 2014 |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | $ 142,225,000 | $ 131,753,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 142,225,000 | 131,753,000 | | $ 142,225,000 | $ 131,753,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 142,225,000 | 131,753,000 | | 142,225,000 | 131,753,000 |
Effect of one-percentage point change in assumed health care cost trend rates [Abstract] | | | | | | | |
Agreement to settle installment payment obligation in exchange for a lump-sum payment | | $ 18,157 | | | | | |
Settlement of gain recognized in other income (deductions) | | | 11,522 | | | | |
Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 111,714,000 | 106,940,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 111,714,000 | 106,940,000 | | 111,714,000 | 106,940,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 111,714,000 | 106,940,000 | | 111,714,000 | 106,940,000 |
Level 2 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 16,529,000 | 10,483,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 16,529,000 | 10,483,000 | | 16,529,000 | 10,483,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 16,529,000 | 10,483,000 | | 16,529,000 | 10,483,000 |
Level 3 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 13,982,000 | 14,330,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | 13,982,000 | 14,330,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | 13,982,000 | 14,330,000 |
Equity Securities - Stocks [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 31,559,000 | 35,310,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 31,559,000 | 35,310,000 | | 31,559,000 | 35,310,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 31,559,000 | 35,310,000 | | 31,559,000 | 35,310,000 |
Equity Securities - Stocks [Member] | Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 31,559,000 | 35,310,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 31,559,000 | 35,310,000 | | 31,559,000 | 35,310,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 31,559,000 | 35,310,000 | | 31,559,000 | 35,310,000 |
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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 0 | 0 |
Equity Securities - Mutual Funds [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 28,901,000 | 31,674,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 28,901,000 | 31,674,000 | | 28,901,000 | 31,674,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 28,901,000 | 31,674,000 | | 28,901,000 | 31,674,000 |
Equity Securities - Mutual Funds [Member] | Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 27,846,000 | 30,694,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 27,846,000 | 30,694,000 | | 27,846,000 | 30,694,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 27,846,000 | 30,694,000 | | 27,846,000 | 30,694,000 |
Equity Securities - Mutual Funds [Member] | Level 2 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 1,055,000 | 980,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 1,055,000 | 980,000 | | 1,055,000 | 980,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 1,055,000 | 980,000 | | 1,055,000 | 980,000 |
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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 0 | 0 |
Fixed Income Securities [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 55,118,000 | 29,545,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 55,118,000 | 29,545,000 | | 55,118,000 | 29,545,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 55,118,000 | 29,545,000 | | 55,118,000 | 29,545,000 |
Fixed Income Securities [Member] | Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 39,644,000 | 20,042,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 39,644,000 | 20,042,000 | | 39,644,000 | 20,042,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 39,644,000 | 20,042,000 | | 39,644,000 | 20,042,000 |
Fixed Income Securities [Member] | Level 2 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 15,474,000 | 9,503,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 15,474,000 | 9,503,000 | | 15,474,000 | 9,503,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 15,474,000 | 9,503,000 | | 15,474,000 | 9,503,000 |
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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 0 | 0 |
Cash and Cash Equivalents [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 4,494,000 | 14,796,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 4,494,000 | 14,796,000 | | 4,494,000 | 14,796,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 4,494,000 | 14,796,000 | | 4,494,000 | 14,796,000 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 4,494,000 | 14,796,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 4,494,000 | 14,796,000 | | 4,494,000 | 14,796,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 4,494,000 | 14,796,000 | | 4,494,000 | 14,796,000 |
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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 0 | 0 |
Other Investments [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 22,153,000 | 20,428,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 22,153,000 | 20,428,000 | | 22,153,000 | 20,428,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 22,153,000 | 20,428,000 | | 22,153,000 | 20,428,000 |
Other Investments [Member] | Level 1 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 8,171,000 | 6,098,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 8,171,000 | 6,098,000 | | 8,171,000 | 6,098,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 8,171,000 | 6,098,000 | | 8,171,000 | 6,098,000 |
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 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 0 | 0 | | 0 | 0 |
Other Investments [Member] | Level 3 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, end of year | | | 13,982,000 | 14,330,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | 13,982,000 | 14,330,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | 13,982,000 | 14,330,000 |
Principal Retirement Plan [Member] | | | | | | | |
Contributions during fiscal 2015: | | | | | | | |
Pension contributions | | | 0 | | | | |
Other postretirement contributions | | | 0 | | | | |
Supplemental Retirement Plan [Member] | | | | | | | |
Contributions during fiscal 2015: | | | | | | | |
Pension contributions | | | 725,000 | | | | |
Other postretirement contributions | | | 0 | | | | |
Pension Plans [Member] | | | | | | | |
Change in benefit obligation [Roll Forward] | | | | | | | |
Benefit obligation, beginning of year | | | 211,036,000 | 186,077,000 | | | |
Acquisitions | | | 27,162,000 | 0 | | | |
Service cost | | | 6,764,000 | 6,150,000 | $ 7,160,000 | | |
Interest cost | | | 8,740,000 | 8,927,000 | 8,024,000 | | |
Actuarial (gain) loss | | | 4,087,000 | 18,412,000 | | | |
Exchange gain | | | (1,206,000) | (703,000) | | | |
Benefit payments | [1] | | (17,856,000) | (7,827,000) | | | |
Benefit obligation, end of year | | | 238,727,000 | 211,036,000 | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, beginning of year | | | 131,753,000 | 123,713,000 | | | |
Acquisitions | | | 25,897,000 | 0 | | | |
Actual return | | | 625,000 | 10,792,000 | | | |
Benefit payments | [1] | | (17,856,000) | (7,827,000) | | | |
Employer contributions | | | 1,806,000 | 5,075,000 | | | |
Fair value, end of year | | | 142,225,000 | 131,753,000 | | | |
Funded status | | | | | | (96,502,000) | (79,283,000) |
Unrecognized actuarial loss (gain) | | | | | | 77,368,000 | 69,153,000 |
Unrecognized prior service cost | | | | | | (1,231,000) | (1,411,000) |
Net amount recognized | | | | | | (20,365,000) | (11,541,000) |
Amounts recognized in the consolidated balance sheet: | | | | | | | |
Current liability | | | | | | (749,000) | (733,000) |
Noncurrent benefit liability | | | | | | (95,753,000) | (78,550,000) |
Accumulated other comprehensive loss (income) | | | | | | 76,137,000 | 67,742,000 |
Net amount recognized | | | | | | (20,365,000) | (11,541,000) |
Amounts recognized in accumulated other comprehensive loss (income): | | | | | | | |
Net actuarial loss (income) | | | | | | 77,368,000 | 69,153,000 |
Prior service cost | | | | | | (1,231,000) | (1,411,000) |
Net amount recognized | | | | | | 76,137,000 | 67,742,000 |
Accumulated benefit obligations in excess of plan assets [Abstract] | | | | | | | |
Accumulated benefit obligation | | | | | | 208,407,000 | 180,265,000 |
Projected benefit obligation | | | | | | 238,727,000 | 211,036,000 |
Settlement of the employees pension obligations | | | 10,000 | | | | |
Net periodic benefit cost [Abstract] | | | | | | | |
Service cost | | | 6,764,000 | 6,150,000 | 7,160,000 | | |
Interest cost | | | 8,740,000 | 8,927,000 | 8,024,000 | | |
Expected return on plan assets | | | (10,151,000) | (9,666,000) | (9,071,000) | | |
Amortization: | | | | | | | |
Prior service cost | | | (180,000) | (206,000) | (206,000) | | |
Net actuarial loss (gain) | | | 6,203,000 | 3,927,000 | 7,903,000 | | |
Net benefit cost | | | 11,376,000 | $ 9,132,000 | $ 13,810,000 | | |
Amounts of AOCI expected to be recognized in net periodic benefit costs [Abstract] | | | | | | | |
Net actuarial loss | | | 7,473,000 | | | | |
Prior service cost | | | $ (183,000) | | | | |
Weighted-average assumptions [Abstract] | | | | | | | |
Discount rate | | | 4.25% | 4.25% | 5.00% | | |
Return on plan assets | | | 7.75% | 7.75% | 8.00% | | |
Compensation increase | | | 3.50% | 3.50% | 3.50% | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Equity securities | | | | | | 60,460,000 | 66,984,000 |
Fixed income, cash and cash equivalents | | | | | | 59,612,000 | 44,341,000 |
Other investments | | | | | | 22,153,000 | 20,428,000 |
Fair value of plan assets | | | $ 142,225,000 | $ 131,753,000 | | 142,225,000 | 131,753,000 |
Target allocation [Abstract] | | | | | | | |
Equity securities | | | 50.00% | | | | |
Fixed income, cash and cash equivalents | | | 30.00% | | | | |
Other investments | | | 20.00% | | | | |
Total target asset allocation | | | 100.00% | | | | |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | $ 142,225,000 | 131,753,000 | | 142,225,000 | 131,753,000 |
Benefit payments expected to be paid [Abstract] | | | | | | | |
2,016 | | | | | | 9,074,000 | |
2,017 | | | | | | 9,519,000 | |
2,018 | | | | | | 10,075,000 | |
2,019 | | | | | | 10,673,000 | |
2,020 | | | | | | 11,249,000 | |
2021-2025 | | | | | | 65,563,000 | |
Total | | | | | | $ 116,153,000 | |
Pension Plans [Member] | Equity Securities [Member] | | | | | | | |
Target allocation [Abstract] | | | | | | | |
Cash included in plan assets | | | | | | 15.00% | |
Pension Plans [Member] | Fixed Income Securities [Member] | | | | | | | |
Target allocation [Abstract] | | | | | | | |
Cash included in plan assets | | | | | | 85.00% | |
Pension Plans [Member] | Other Investments [Member] | Level 3 [Member] | | | | | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, beginning of year | | | 14,330,000 | 18,942,000 | | | |
Acquisitions | | | 0 | 0 | | | |
Dispositions | | | (1,661,000) | (5,439,000) | | | |
Realized Gains | | | 608,000 | 1,118,000 | | | |
Unrealized Gains (Losses) | | | 705,000 | (291,000) | | | |
Fair value, end of year | | | 13,982,000 | 14,330,000 | | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | $ 13,982,000 | 14,330,000 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | 13,982,000 | 14,330,000 | | 13,982,000 | 14,330,000 |
Other Postretirement Plans [Member] | | | | | | | |
Change in benefit obligation [Roll Forward] | | | | | | | |
Benefit obligation, beginning of year | | | 21,358,000 | 18,881,000 | | | |
Acquisitions | | | 0 | 0 | | | |
Service cost | | | 454,000 | 436,000 | $ 796,000 | | |
Interest cost | | | 885,000 | 919,000 | 1,129,000 | | |
Actuarial (gain) loss | | | (814,000) | 1,929,000 | | | |
Exchange gain | | | 0 | 0 | | | |
Benefit payments | [1] | | (1,459,000) | (807,000) | | | |
Benefit obligation, end of year | | | 20,424,000 | 21,358,000 | | | |
Change in plan assets [Roll Forward] | | | | | | | |
Fair value, beginning of year | | | 0 | 0 | | | |
Acquisitions | | | 0 | 0 | | | |
Actual return | | | 0 | 0 | | | |
Benefit payments | [1] | | (1,459,000) | (807,000) | | | |
Employer contributions | | | 1,459,000 | 807,000 | | | |
Fair value, end of year | | | 0 | 0 | | | |
Funded status | | | | | | (20,424,000) | (21,358,000) |
Unrecognized actuarial loss (gain) | | | | | | (1,801,000) | (987,000) |
Unrecognized prior service cost | | | | | | (1,111,000) | (1,306,000) |
Net amount recognized | | | | | | (23,336,000) | (23,651,000) |
Amounts recognized in the consolidated balance sheet: | | | | | | | |
Current liability | | | | | | (1,009,000) | (1,007,000) |
Noncurrent benefit liability | | | | | | (19,415,000) | (20,351,000) |
Accumulated other comprehensive loss (income) | | | | | | (2,912,000) | (2,293,000) |
Net amount recognized | | | | | | (23,336,000) | (23,651,000) |
Amounts recognized in accumulated other comprehensive loss (income): | | | | | | | |
Net actuarial loss (income) | | | | | | (1,801,000) | (987,000) |
Prior service cost | | | | | | (1,111,000) | (1,306,000) |
Net amount recognized | | | | | | (2,912,000) | (2,293,000) |
Net periodic benefit cost [Abstract] | | | | | | | |
Service cost | | | 454,000 | 436,000 | 796,000 | | |
Interest cost | | | 885,000 | 919,000 | 1,129,000 | | |
Expected return on plan assets | | | 0 | 0 | 0 | | |
Amortization: | | | | | | | |
Prior service cost | | | (195,000) | (195,000) | (272,000) | | |
Net actuarial loss (gain) | | | 0 | (87,000) | 439,000 | | |
Net benefit cost | | | 1,144,000 | $ 1,073,000 | $ 2,092,000 | | |
Contributions during fiscal 2015: | | | | | | | |
Pension contributions | | | 0 | | | | |
Other postretirement contributions | | | 1,459,000 | | | | |
Amounts of AOCI expected to be recognized in net periodic benefit costs [Abstract] | | | | | | | |
Net actuarial loss | | | 0 | | | | |
Prior service cost | | | $ (195,000) | | | | |
Weighted-average assumptions [Abstract] | | | | | | | |
Discount rate | | | 4.25% | 4.25% | 5.00% | | |
Return on plan assets | | | 0.00% | 0.00% | 0.00% | | |
Compensation increase | | | 0.00% | 0.00% | 0.00% | | |
Weighted average asset allocation [Abstract] | | | | | | | |
Fair value of plan assets | | | $ 0 | $ 0 | | 0 | 0 |
Fair value of plan assets [Abstract] | | | | | | | |
Fair value of plan assets | | | $ 0 | $ 0 | | 0 | $ 0 |
Benefit payments expected to be paid [Abstract] | | | | | | | |
2,016 | | | | | | 1,009,000 | |
2,017 | | | | | | 1,051,000 | |
2,018 | | | | | | 1,146,000 | |
2,019 | | | | | | 1,194,000 | |
2,020 | | | | | | 1,169,000 | |
2021-2025 | | | | | | 6,507,000 | |
Total | | | | | | $ 12,076,000 | |
Assumed health care cost trend rates [Abstract] | | | | | | | |
Per capita cost of health care benefits assumed for next fiscal year | | | 7.00% | | | | |
Ultimate health care cost trend rate | | | 4.00% | | | | |
Year that rate reaches ultimate trend rate | | | | | | 2,070 | |
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 | | | $ 923,000 | | | | |
Effect of one percentage point increase on service and interest cost components | | | 68,000 | | | | |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | | | 809,000 | | | | |
Effect of one percentage point decrease on service and interest cost components | | | 59,000 | | | | |
Other Retirement Plans [Member] | | | | | | | |
Contributions during fiscal 2015: | | | | | | | |
Pension contributions | | | 1,081,000 | | | | |
Other postretirement contributions | | | $ 0 | | | | |
| |
[1] | Pension benefit payments in fiscal 2015 includes $10,000 of lump sum distributions that were made to certain terminated vested employees as a settlement of the employees' pension obligations. These distributions did not meet the threshold to qualify as a settlement under U.S. GAAP and therefore, no unamortized actuarial loss was recognized in the Statement of Income upon completion of the lump sum distributions. | |