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DERIVATIVE INSTRUMENTS (Tables)
 9 Months Ended
Jun. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block]
The following table reflects the fair value of NJR's derivative assets and liabilities recognized in the Unaudited Condensed Consolidated Balance Sheets as of:
 
 
 
Fair Value
 
 
 
June 30, 2012
 
September 30, 2011
(Thousands)
Balance Sheet Location
Asset
Derivatives
Liability
Derivatives
Asset
Derivatives
Liability
Derivatives
Derivatives designated as hedging instruments:
 
 
 
 
 
 
 
 
NJRES:
 
 
 
 
 
 
 
 
 
Foreign currency contracts
Derivatives - current
 
$
122

 
$
17

 
$
153

 
$
8

 
Derivatives - noncurrent
 
40

 
11

 
127

 
6

Fair value of derivatives designated as hedging instruments
 
$
162

 
$
28

 
$
280

 
$
14

 
 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
NJNG:
 
 
 
 
 
 
 
 
 
Financial commodity contracts
Derivatives - current
 
$
4,416

 
$
23,042

 
$
5,424

 
$
13,258

 
Derivatives - noncurrent
 
698

 
—

 
2

 
620

NJRES:
 
 

 

 

 

Physical forward commodity contracts
Derivatives - current
 
20,715

 
8,870

 
33,240

 
10,570

 
Derivatives - noncurrent
 
1,481

 
307

 
4,450

 
781

Financial commodity contracts
Derivatives - current
 
29,226

 
19,320

 
61,521

 
44,862

 
Derivatives - noncurrent
 
874

 
2,687

 
1,936

 
4,934

Fair value of derivatives not designated as hedging instruments
 
$
57,410

 
$
54,226

 
$
106,573

 
$
75,025

Total fair value of derivatives
 
 
$
57,572

 
$
54,254

 
$
106,853

 
$
75,039
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
The following table reflects the effect of derivative instruments on the Unaudited Condensed Consolidated Statements of Operations as of:
(Thousands)
Location of gain (loss) recognized in income on derivatives
Amount of gain (loss) recognized
in income on derivatives
 
 
Three Months Ended
Nine Months Ended
 
 
June 30,
June 30,
Derivatives not designated as hedging instruments:
2012
 
2011
2012
 
2011
NJRES:
 
 
 
 
 
 
 
Physical commodity contracts
Operating revenues
$
(2,860
)
 
$
5,044

$
(6,023
)
 
$
29,881

Physical commodity contracts
Gas purchases
8,155

 
4,639

12,546

 
(1,467
)
Financial commodity contracts
Gas purchases
(9,717
)
 
8,703

93,248

 
(19,072
)
Total unrealized and realized (losses) gains
$
(4,422
)
 
$
18,386

$
99,771

 
$
9,342
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]
The following table reflect the effect of derivative instruments designated as cash flow hedges on OCI as of:
(Thousands)
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion)
Amount of Gain or (Loss) Recognized on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 
Three Months Ended
Three Months Ended
Three Months Ended
 
June 30,
June 30,
June 30,
Derivatives in cash flow hedging relationships:
2012
2011
2012
2011
2012
2011
Foreign currency contracts
$
12

$
3

$
(35
)
$
32

$
—

$
—


(Thousands)
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (1)
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion)
Amount of Gain or (Loss) Recognized on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 
Nine Months Ended
Nine Months Ended
Nine Months Ended
 
June 30,
June 30,
June 30,
Derivatives in cash flow hedging relationships:
2012
2011
2012
2011
2012
2011
Foreign currency contracts
$
(63
)
$
164

$
(70
)
$
91

$
—

$
—

(1)
The settlement of foreign currency transactions over the next twelve months is expected to result in the reclassification of $104,000 from OCI into earnings. The maximum tenor is April 2015
Schedule of Derivative Instruments [Text Block]
NJNG and NJRES had the following outstanding long (short) derivatives as of:
 
 
 
Volume (Bcf)
 
 
 
June 30,
2012
September 30,
2011
NJNG
Futures
 
11.1

23.7

 
Swaps
 
0.1

(1.8
)
 
Options
 
0.1

1.1

NJRES
Futures
 
(28.4
)
(13.8
)
 
Swaps
 
(4.4
)
(41.9
)
 
Options
 
—

—

 
Physical
 
0.3

58.3
Schedule of Due to (from) Broker-Dealers and Clearing Organizations [Text Block]
The Company maintains broker margin accounts for NJNG and NJRES. The balances by company, are as follows:
(Thousands)
Balance Sheet Location
June 30,
2012
September 30,
2011
NJNG
Broker margin - Current assets
$
20,995

$
11,722

NJRES (1)
Broker margin - Current assets
$
21,920

$
10,873


(1)
As of June 30, 2012, NJRES' balance includes $20.2 million related to the remaining exposure at MF Global.
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
The amounts presented below have not been reduced by any collateral received or netting.
(Thousands)
Gross Credit
Exposure
Investment grade
 
$
125,897

 
Noninvestment grade
 
25,088

 
Internally rated investment grade
 
15,916

 
Internally rated noninvestment grade
 
6,035

 
Total
 
$
172,936