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EMPLOYEE BENEFIT PLANS (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Components of net periodic cost |  |
Discretionary contribution | $ 0 | $ 0
Pension |  |
Components of net periodic cost |  |
Service cost | 1,845,000 | 2,035,000
Interest cost | 3,043,000 | 2,623,000
Expected return on plan assets | (4,763,000) | (4,910,000)
Recognized actuarial loss | 1,441,000 | 1,884,000
Prior service cost amortization | 25,000 | 27,000
Net periodic benefit cost | 1,591,000 | 1,659,000
OPEB |  |
Components of net periodic cost |  |
Service cost | 1,101,000 | 1,152,000
Interest cost | 2,081,000 | 1,591,000
Expected return on plan assets | (1,379,000) | (1,338,000)
Recognized actuarial loss | 1,617,000 | 1,165,000
Prior service cost amortization | (91,000) | (91,000)
Net periodic benefit cost | $ 3,329,000 | $ 2,479,000

X
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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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