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PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Change in plan assets: |  |  |
Fair value, beginning of year | $ 151,864 |  |
Fair value, end of year | 155,634 | $ 151,864 |
Pension |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | 263,566 | 238,727 |
Service cost | 8,553 | 7,446 | $ 6,764
Interest cost | 7,362 | 9,725 | 8,740
Actuarial (gain) loss | (4,264) | 26,841 |
Exchange loss (gain) | 589 | (6) |
Benefit payments | (16,134) | (19,167) |
Benefit obligation, end of year | 259,672 | 263,566 | 238,727
Change in plan assets: |  |  |
Fair value, beginning of year | 151,864 | 142,225 |
Actual return | 12,586 | 11,244 |
Benefit payments | (16,134) | (19,167) |
Employer contributions | 7,318 | 17,562 |
Fair value, end of year | 155,634 | 151,864 | 142,225
Funded status | (104,039) | (111,701) |
Amounts recognized in the consolidated balance sheet: |  |  |
Current liability | (766) | (760) |
Noncurrent benefit liability | (103,273) | (110,941) |
Accumulated other comprehensive loss (income) | 72,926 | 91,262 |
Net amount recognized | (31,113) | (20,439) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |
Net actuarial loss (income) | 73,616 | 92,310 |
Prior service cost | (690) | (1,048) |
Distributions to terminated employees | 5,655 | 9,300 |
Other Postretirement |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | 23,290 | 20,424 |
Service cost | 392 | 402 | 454
Interest cost | 626 | 845 | 885
Actuarial (gain) loss | (2,600) | 2,931 |
Exchange loss (gain) | 0 | 0 |
Benefit payments | (1,392) | (1,312) |
Benefit obligation, end of year | 20,316 | 23,290 | 20,424
Change in plan assets: |  |  |
Fair value, beginning of year | 0 | 0 |
Actual return | 0 | 0 |
Benefit payments | (1,392) | (1,312) |
Employer contributions | 1,392 | 1,312 |
Fair value, end of year | 0 | 0 | $ 0
Funded status | (20,317) | (23,291) |
Amounts recognized in the consolidated balance sheet: |  |  |
Current liability | (1,044) | (1,148) |
Noncurrent benefit liability | (19,273) | (22,143) |
Accumulated other comprehensive loss (income) | (2,189) | 214 |
Net amount recognized | (22,506) | (23,077) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |
Net actuarial loss (income) | (1,469) | 1,130 |
Prior service cost | $ (720) | $ (916) |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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