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EMPLOYEE BENEFIT PLANS (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Components of net periodic cost |  |  |  |
Discretionary contribution |  |  | $ 0 | $ 0
Pension |  |  |  |
Components of net periodic cost |  |  |  |
Service cost | $ 1,846,000 | $ 2,034,000 | 3,691,000 | 4,069,000
Interest cost | 3,043,000 | 2,624,000 | 6,086,000 | 5,247,000
Expected return on plan assets | (4,764,000) | (4,909,000) | (9,527,000) | (9,819,000)
Recognized actuarial loss | 1,441,000 | 1,885,000 | 2,882,000 | 3,769,000
Prior service cost amortization | 26,000 | 26,000 | 51,000 | 53,000
Net periodic benefit cost | 1,592,000 | 1,660,000 | 3,183,000 | 3,319,000
OPEB |  |  |  |
Components of net periodic cost |  |  |  |
Service cost | 1,101,000 | 1,151,000 | 2,202,000 | 2,303,000
Interest cost | 2,081,000 | 1,591,000 | 4,162,000 | 3,182,000
Expected return on plan assets | (1,379,000) | (1,338,000) | (2,758,000) | (2,676,000)
Recognized actuarial loss | 1,616,000 | 1,165,000 | 3,233,000 | 2,330,000
Prior service cost amortization | (91,000) | (91,000) | (182,000) | (182,000)
Net periodic benefit cost | $ 3,328,000 | $ 2,478,000 | $ 6,657,000 | $ 4,957,000

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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