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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Pension and Other Postemployment Benefit Plans 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 |
The Company does not expect to be required to make additional contributions to fund the pension plans over the next three fiscal years based on current actuarial assumptions; however, funding requirements are uncertain and can depend significantly on changes in actuarial assumptions, returns on plan assets, interest rates and changes in the demographics of eligible employees and covered dependents. In addition, as in the past, the Company may elect to make contributions in excess of the minimum required amount to the plans. There were no discretionary contributions made during the six months ended March 31, 2015 and 2014.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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