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EMPLOYEE BENEFIT PLANS - SUMMARY OF CHANGE IN FUNDED STATUS AND LIABILITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Postemployment employee (liability) |  |  |
Noncurrent | $ (237,221) | $ (246,517) |
Pension |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 360,477 | 298,575 |
Service cost | 8,223 | 7,381 | $ 8,139
Interest cost | 10,587 | 12,173 | 10,493
Plan participants’ contributions | 25 | 43 |
Actuarial loss (gain) | 29,738 | 52,549 |
Benefits paid, net of retiree subsidies received | (11,886) | (10,244) |
Benefit obligation at end of year | 397,164 | 360,477 | 298,575
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 288,634 | 279,410 |
Actual return on plan assets | 30,632 | 19,194 |
Employer contributions | 596 | 231 |
Benefits paid, net of plan participants’ contributions | (11,894) | (10,201) |
Fair value of plan assets at end of year | 307,968 | 288,634 | 279,410
Funded status | (89,196) | (71,843) |
Postemployment employee (liability) |  |  |
Current | (531) | (603) |
Noncurrent | (88,665) | (71,240) |
Total | (89,196) | (71,843) |
OPEB |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 260,003 | 196,785 |
Service cost | 4,854 | 4,404 | 4,607
Interest cost | 7,026 | 8,324 | 6,365
Plan participants’ contributions |  | 210 |
Actuarial loss (gain) |  | 54,700 |
Benefits paid, net of retiree subsidies received |  | (4,420) |
Benefit obligation at end of year |  | 260,003 | 196,785
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 83,926 | 77,980 |
Actual return on plan assets |  | 2,499 |
Employer contributions | 8,400 | 7,926 | 6,200
Benefits paid, net of plan participants’ contributions |  | (4,479) |
Fair value of plan assets at end of year | 96,406 | 83,926 | $ 77,980
Funded status |  | (176,077) |
Postemployment employee (liability) |  |  |
Current | (900) | (800) |
Noncurrent | (148,556) | (175,277) |
Total | (149,456) | (176,077) |
OPEB | Affordable Care Act, Cadillac Tax Repeal |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 260,003 |  |
Service cost | 4,854 |  |
Interest cost | 7,026 |  |
Plan participants’ contributions | 194 |  |
Actuarial loss (gain) | (23,226) |  |
Benefits paid, net of retiree subsidies received | (2,989) |  |
Benefit obligation at end of year | 245,862 | 260,003 |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 83,925 |  |
Actual return on plan assets | 6,872 |  |
Employer contributions | 8,436 |  |
Benefits paid, net of plan participants’ contributions | (2,827) |  |
Fair value of plan assets at end of year | 96,406 | $ 83,925 |
Funded status | $ (149,456) |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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