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EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of the net periodic cost for pension benefits, including the Company's Pension Equalization Plan, and OPEB costs (principally health care and life insurance) for employees and covered dependents were as follows:
| Pension | OPEB
| Three Months Ended | Three Months Ended
| December 31, | December 31,
(Thousands) | 2017 | 2016 | 2017 | 2016
Service cost | $ | 2,035 |  | $ | 2,087 |  | $ | 1,152 |  | $ | 1,095 |
Interest cost | 2,623 |  | 2,443 |  | 1,591 |  | 1,386 |
Expected return on plan assets | (4,910 | ) | (4,828 | ) | (1,338 | ) | (1,192 | )
Recognized actuarial loss | 1,884 |  | 2,207 |  | 1,165 |  | 1,093 |
Prior service cost amortization | 27 |  | 27 |  | (91 | ) | (91 | )
Net periodic benefit cost | $ | 1,659 |  | $ | 1,936 |  | $ | 2,479 |  | $ | 2,291 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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