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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Mar. 31, 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 | Six Months Ended | Three Months Ended | Six Months Ended
| March 31, | March 31, | March 31, | March 31,
(Thousands) | 2013 | 2012 | 2013 | 2012 | 2013 | 2012 | 2013 | 2012
Service cost | $ | 1,718 |  | $ | 1,344 |  | $ | 3,436 |  | $ | 2,688 |  | $ | 1,171 |  | $ | 896 |  | $ | 2,342 |  | $ | 1,792 |
Interest cost | 2,235 |  | 2,206 |  | 4,470 |  | 4,412 |  | 1,287 |  | 1,283 |  | 2,574 |  | 2,566 |
Expected return on plan assets | (3,706 | ) | (3,171 | ) | (7,412 | ) | (6,342 | ) | (913 | ) | (686 | ) | (1,826 | ) | (1,372 | )
Recognized actuarial loss | 1,911 |  | 1,254 |  | 3,822 |  | 2,508 |  | 964 |  | 724 |  | 1,928 |  | 1,448 |
Prior service cost amortization | 27 |  | 11 |  | 54 |  | 22 |  | 7 |  | 6 |  | 14 |  | 12 |
Recognized net initial obligation | — |  | — |  | — |  | — |  | (89 | ) | 89 |  | (178 | ) | 178 |
Net periodic benefit cost | $ | 2,185 |  | $ | 1,644 |  | $ | 4,370 |  | $ | 3,288 |  | $ | 2,427 |  | $ | 2,312 |  | $ | 4,854 |  | $ | 4,624 |
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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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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