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CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments of common stock dividends | $ (67,230) | $ (61,688) | $ (58,650)
NJR [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments of common stock dividends | $ (67,230) | $ (61,688) | $ (58,650)

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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