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EMPLOYEE BENEFIT PLANS | 9 Months Ended
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Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Pension and Other Postemployment Benefit Plans (OPEB) 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 | Nine Months Ended | Three Months Ended | Nine Months Ended
| June 30, | June 30, | June 30, | June 30,
(Thousands) | 2013 | 2012 | 2013 | 2012 | 2013 | 2012 | 2013 | 2012
Service cost | $ | 1,718 |  | $ | 1,344 |  | $ | 5,154 |  | $ | 4,032 |  | $ | 1,171 |  | $ | 896 |  | $ | 3,513 |  | $ | 2,688 |
Interest cost | 2,235 |  | 2,206 |  | 6,705 |  | 6,618 |  | 1,287 |  | 1,283 |  | 3,861 |  | 3,849 |
Expected return on plan assets | (3,706 | ) | (3,171 | ) | (11,118 | ) | (9,513 | ) | (913 | ) | (687 | ) | (2,739 | ) | (2,059 | )
Recognized actuarial loss | 1,911 |  | 1,254 |  | 5,733 |  | 3,762 |  | 964 |  | 724 |  | 2,892 |  | 2,172 |
Prior service cost amortization | 27 |  | 11 |  | 81 |  | 33 |  | (281 | ) | 6 |  | (267 | ) | 18 |
Recognized net initial obligation | — |  | — |  | — |  | — |  | 199 |  | 89 |  | 21 |  | 267 |
Net periodic benefit cost | $ | 2,185 |  | $ | 1,644 |  | $ | 6,555 |  | $ | 4,932 |  | $ | 2,427 |  | $ | 2,311 |  | $ | 7,281 |  | $ | 6,935 |
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. NJR made discretionary contributions of $20 million to the pension plans in both December 2012 and 2011.

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