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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [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 | Six Months Ended | Three Months Ended | Six Months Ended
| March 31, | March 31, | March 31, | March 31,
(Thousands) | 2015 | 2014 | 2015 | 2014 | 2015 | 2014 | 2015 | 2014
Service cost | $ | 1,871 |  | $ | 1,536 |  | $ | 3,742 |  | $ | 3,072 |  | $ | 1,064 |  | $ | 981 |  | $ | 2,127 |  | $ | 1,962 |
Interest cost | 2,550 |  | 2,517 |  | 5,100 |  | 5,033 |  | 1,435 |  | 1,433 |  | 2,870 |  | 2,866 |
Expected return on plan assets | (4,273 | ) | (3,869 | ) | (8,545 | ) | (7,738 | ) | (1,244 | ) | (1,043 | ) | (2,488 | ) | (2,087 | )
Recognized actuarial loss | 1,747 |  | 1,399 |  | 3,492 |  | 2,798 |  | 735 |  | 625 |  | 1,471 |  | 1,250 |
Prior service cost amortization | 27 |  | 28 |  | 55 |  | 56 |  | (91 | ) | (89 | ) | (182 | ) | (178 | )
Recognized net initial obligation | — |  | — |  | — |  | — |  | — |  | 2 |  | — |  | 5 |
Net periodic benefit cost | $ | 1,922 |  | $ | 1,611 |  | $ | 3,844 |  | $ | 3,221 |  | $ | 1,899 |  | $ | 1,909 |  | $ | 3,798 |  | $ | 3,818 |

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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=35743120&loc=d3e1928-114920 + Details
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