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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Dec. 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 | Three Months Ended
| December 31, | December 31,
(Thousands) | 2015 | 2014 | 2015 | 2014
Service cost | $ | 1,898 |  | $ | 1,871 |  | $ | 1,130 |  | $ | 1,063 |
Interest cost | 2,836 |  | 2,550 |  | 1,564 |  | 1,435 |
Expected return on plan assets | (5,029 | ) | (4,272 | ) | (1,211 | ) | (1,244 | )
Recognized actuarial loss | 1,820 |  | 1,745 |  | 819 |  | 736 |
Prior service cost amortization | 28 |  | 28 |  | (91 | ) | (91 | )
Net periodic benefit cost | $ | 1,553 |  | $ | 1,922 |  | $ | 2,211 |  | $ | 1,899 |
The Company made a discretionary contribution of $30 million during the three months ended December 31, 2015, to improve the funded status of the pension plans based on current actuarial assumptions, which includes the most recent mortality table change. The Company does not expect to be required to make additional contributions to fund the pension plans over the next two 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 three months ended December 31, 2014.

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