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DEBT (Tables) | 6 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Line of Credit Facilities | A summary of NJR's credit facility and NJNG's commercial paper program and credit facility are as follows:
(Thousands) | March 31, 2018 |  | September 30, 2017 |  | Expiration Dates
NJR |  |  |  |  |
Bank revolving credit facilities (1) | $ | 425,000 |  |  | $ | 425,000 |  |  | September 2020
Notes outstanding at end of period | $ | 150,900 |  |  | $ | 255,000 |  |  |
Weighted average interest rate at end of period | 2.60 | % |  | 2.14 | % |  |
Amount available at end of period (2) | $ | 263,326 |  |  | $ | 156,601 |  |  |
Bank revolving credit facilities (1) | $ | 100,000 |  |  | $ | — |  |  | April 2018
Amount available at end of period | $ | 100,000 |  |  | $ | — |  |  |
NJNG |  |  |  |  |
Bank revolving credit facilities (1) | $ | 250,000 |  |  | $ | 250,000 |  |  | May 2019
Commercial paper outstanding at end of period | $ | — |  |  | $ | 11,000 |  |  |
Weighted average interest rate at end of period | — | % |  | 1.13 | % |  |
Amount available at end of period (3) | $ | 249,269 |  |  | $ | 238,269 |  |  |
(1) | Committed credit facilities, which require commitment fees on the unused amounts.
(2) | Letters of credit outstanding total $10.8 million and $13.4 million for March 31, 2018 and September 30, 2017, respectively, which reduces amount available by the same amount.
(3) | Letters of credit outstanding total $731,000 for both March 31, 2018 and September 30, 2017, which reduces the amount available by the same amount.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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