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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Change in plan assets: |  |  |
Fair value, beginning of year | $ 155,313 |  |
Fair value, end of year | 168,134 | $ 155,313 |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |
Equity and fixed income mutual funds | 24,610 | 22,986 |
Pension |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | 289,957 | 241,553 |
Service cost | 8,679 | 7,998 | $ 8,159
Interest cost | 7,735 | 9,202 | 8,210
Actuarial loss (gain) | 23,827 | 43,198 |
Exchange loss (gain) | 799 | (581) |
Benefit payments | (12,110) | (11,413) |
Benefit obligation, end of year | 318,887 | 289,957 | 241,553
Change in plan assets: |  |  |
Fair value, beginning of year | 155,313 | 158,662 |
Actual return | 8,705 | 6,852 |
Benefit payments | (12,110) | (11,413) |
Employer contributions | 16,226 | 1,212 |
Fair value, end of year | 168,134 | 155,313 | 158,662
Funded status (1) | (150,753) | (134,644) |
Amounts recognized in the consolidated balance sheet: |  |  |
Current liability | (905) | (882) |
Noncurrent benefit liability | (149,848) | (133,762) |
Accumulated other comprehensive loss (income) | (111,314) | (95,374) |
Net amount recognized | (39,439) | (39,270) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |
Net actuarial loss (income) | 110,971 | 95,741 |
Prior service cost | 343 | (367) |
Other Postretirement |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | 20,952 | 18,826 |
Service cost | 227 | 244 | 335
Interest cost | 501 | 718 | 631
Actuarial loss (gain) | (1,402) | 2,212 |
Exchange loss (gain) | 0 | 0 |
Benefit payments | (847) | (1,048) |
Benefit obligation, end of year | 19,431 | 20,952 | 18,826
Change in plan assets: |  |  |
Fair value, beginning of year | 0 | 0 |
Actual return | 0 | 0 |
Benefit payments | (847) | (1,048) |
Employer contributions | 847 | 1,048 |
Fair value, end of year | 0 | 0 | $ 0
Funded status (1) | (19,431) | (20,952) |
Amounts recognized in the consolidated balance sheet: |  |  |
Current liability | (831) | (989) |
Noncurrent benefit liability | (18,600) | (19,963) |
Accumulated other comprehensive loss (income) | 1,372 | 436 |
Net amount recognized | (20,803) | (21,388) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |
Net actuarial loss (income) | 676 | (106) |
Prior service cost | $ (2,048) | $ (330) |

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