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STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 2,130 |  | $ 2,638 |  | $ 2,847 |
Income tax benefit | (870) |  | (1,078) |  | (1,163) |
Total, net of tax | 1,260 |  | 1,560 |  | 1,684 |
Deferred compensation related to unvested restricted and performance shares | 2,000 |  |  |  |  |
Deferred compensation related to unvested performance shares, period | 2 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Beginning, Shares | 81,625 |  | 109,763 |  | 263,128 |
Granted, Shares | 0 |  | 0 |  | 0 |
Exercised, Shares | (15,000) |  | (28,138) |  | (152,448) |
Forfeited, Shares | 0 |  | 0 |  | (917) |
Ending, Shares | 66,625 |  | 81,625 |  | 109,763 |
Beginning, Weighted Average Exercise Price (in usd per share) | $ 28.71 |  | $ 27.84 |  | $ 27.24 |
Granted, Weighted Average Exercise Price (in usd per share) | $ 0.00 |  | $ 0.00 |  | $ 0.00 |
Exercised, Weighted Average Exercise Price (in usd per share) | $ 25.08 |  | $ 25.30 |  | $ 26.86 |
Forfeited, Weighted Average Exercise Price (in usd per share) | $ 0.00 |  | $ 0.00 |  | $ 18.11 |
Ending, Weighted Average Exercise Price (in usd per share) | $ 29.53 |  | $ 28.71 |  | $ 27.84 |
Options, Oustanding and Exercisable | 66,625 |  | 81,625 |  | 109,763 |
Options, Outstanding and Exercisable, Weighted Average Remaining Contractual Term (in years) | 1 year 5 months 25 days |  |  |  |  |
Options, Outstanding and Exercisable, Weighted Average Exercise Price (in usd per share) | $ 29.53 |  | $ 28.71 |  | $ 27.84 |
Options, Outstanding and Exercisable, Aggregate Intrinsic Value | 1,968 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Beginning, Weighted Average Grant Date Fair Value (in usd per share) | $ 33.26 |  | $ 28.04 |  | $ 31.07 |
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ 30.74 |  | $ 47.17 |  | $ 26.24 |
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ 0.00 |  | $ 30.08 |  | $ 0.00 |
Cancelled/forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ 26.24 |  | $ 0.00 |  | $ 29.74 |
Ending, Weighted Average Grant Date Fair Value (in usd per share) | $ 36.70 |  | $ 33.26 |  | $ 28.04 |
Operation and Maintenance [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | 2,100 |  | 2,600 |  | 2,800 |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | 1,049 |  | 1,276 |  | 915 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Beginning, Shares | 84,743 | [1] | 106,027 | [1] | 50,475 | [1]
Vested, Shares | 0 | [1] | (49,702) | [1] | 0 | [1],[2]
Cancelled/forfeited, shares | (56,325) | [1] | 0 | [1] | (773) | [1]
Ending, Shares | 78,322 | [1] | 84,743 | [1] | 106,027 | [1]
Percent of awards to common stock, target | 100.00% |  |  |  |  |
Performance Shares, Market Condition Award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares |  |  | 28,418 | [1] | 56,325 | [1]
Percent of awards to common stock | 70.00% |  |  |  |  |
Number of common shared issued | 19,095 |  |  |  |  |
Performance Shares, Subject to Performance Conditions [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation related to unvested restricted and performance shares | 1,500 |  |  |  |  |
Deferred compensation related to unvested performance shares, period | 2 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares | 49,904 | [1] |  |  |  |
Percent of awards to common stock | 68.80% |  |  |  |  |
Number of common shared issued | 15,427 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | 1,081 |  | 1,362 |  | 1,932 |
Deferred compensation related to unvested restricted and performance shares | 452 |  |  |  |  |
Deferred compensation related to unvested performance shares, period | 2 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Beginning, Shares | 59,346 |  | 77,097 |  | 56,365 |
Granted, Shares | 69,434 |  | 51,100 |  | 62,149 |
Vested, Shares | (86,975) | [3] | (68,851) | [3] | (41,201) |
Cancelled/forfeited, shares | (2,550) |  | 0 |  | (216) |
Ending, Shares | 39,255 |  | 59,346 |  | 77,097 |
Beginning, Weighted Average Grant Date Fair Value (in usd per share) | $ 40.40 |  | $ 39.90 |  | $ 33.40 |
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ 40.62 |  | $ 47.17 |  | $ 40.74 |
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ 40.28 |  | $ 44.86 |  | $ 32.29 |
Cancelled/forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ 40.74 |  | $ 0.00 |  | $ 36.42 |
Ending, Weighted Average Grant Date Fair Value (in usd per share) | $ 41.05 |  | $ 40.40 |  | $ 39.90 |
Vested, Total Fair Value of Vested Shares (dollars) | 3,622 |  | 3,198 |  | 1,723 |
Shares forfeited in period, previously granted and vested | 4,673 |  | 4,673 |  |  |
Restricted Stock [Member] | Scheduled to Vest Immediately [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares | 67,295 |  | 49,171 |  |  |
Restricted Stock [Member] | Vesting October 2015 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares | 2,139 |  |  |  |  |
Restricted Stock [Member] | Vesting October 2014 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares |  |  | 1,929 |  |  |
Restricted Stock [Member] | Vesting in Three Equal Annual Installments, The First Occuring on October 15, 2011 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares |  |  |  |  | 36,614 |
Restricted Stock [Member] | All Scheduled to Vest on November 17, 2013 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted, Shares |  |  |  |  | 25,535 |
Minimum [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Percent of awards to common stock | 0.00% |  |  |  |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Percent of awards to common stock | 150.00% |  |  |  |  |
Range 1 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Options, Oustanding and Exercisable | 17,250 |  |  |  |  |
Options, Outstanding and Exercisable, Weighted Average Remaining Contractual Term (in years) | 1 year 2 months 27 days |  |  |  |  |
Options, Outstanding and Exercisable, Weighted Average Exercise Price (in usd per share) | $ 27.75 |  |  |  |  |
Options, Outstanding and Exercisable, Aggregate Intrinsic Value | 479 |  |  |  |  |
Options, Outstanding and Exercisable, Lower Exercie Price Range (in usd per share) | $ 25.12 |  |  |  |  |
Options, Outstanding and Exercisable, Upper Exercie Price Range (in usd per share) | $ 28.65 |  |  |  |  |
Range 2 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Options, Oustanding and Exercisable | 49,375 |  |  |  |  |
Options, Outstanding and Exercisable, Weighted Average Remaining Contractual Term (in years) | 1 year 6 months 26 days |  |  |  |  |
Options, Outstanding and Exercisable, Weighted Average Exercise Price (in usd per share) | $ 30.15 |  |  |  |  |
Options, Outstanding and Exercisable, Aggregate Intrinsic Value | $ 1,489 |  |  |  |  |
Options, Outstanding and Exercisable, Lower Exercie Price Range (in usd per share) | $ 28.66 |  |  |  |  |
Options, Outstanding and Exercisable, Upper Exercie Price Range (in usd per share) | $ 30.37 |  |  |  |  |
Employee [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future issuance | 1,669,541 |  |  |  |  |
Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future issuance | 44,976 |  |  |  |  |
[1] | The number of common shares issued related to performance shares may range from zero to 150 percent of the number of shares shown in the table above based on the Company's achievement of performance goals associated with NJR total shareowner return relative to a selected peer group of companies.
[2] | As certified by the Company's Leadership and Compensation Committee on November 13, 2012, the number of common shares related to performance shares and market condition shares earned was 68.8 percent , or 15,427 shares and 70 percent, or 19,095 shares, respectively. The number represented on this line is the target number of 100 percent. See footnote (1) above.
[3] | A total of 4,673 previously granted and vested deferred restricted shares were forfeited prior to distribution due to non compliance with the terms of the agreement.

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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