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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]  
Schedule of Utility Inventory
The following table summarizes gas in storage, at average cost by company as of:
 
March 31,
2013
September 30,
2012
($ in thousands)
Gas in Storage
 
Bcf
Gas in Storage
 
Bcf
NJNG
 
$
14,891

2.4

 
$
145,379

22.2

NJRES
 
152,772

43.8

 
119,814

45.5

Total
 
$
167,663

46.2

 
$
265,193

67.7
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income
(Thousands)
Unrealized gain on available for sale securities
Net unrealized gain on derivatives
Adjustment to postemployment benefit obligation
Total
Beginning balance as of January 1, 2013
$
4,601

 
$
41

 
$
(15,330
)
 
$
(10,688
)
Other comprehensive income, excluding reclassifications, net of tax of $(447), $(9), $-, $(456)
647

 
15

 
—

 
662

Amounts reclassified from accumulated other comprehensive income, net of tax of $-, $13, $(203), $(190)
—

 
(22
)
(1) 
296

(2) 
274

Net current-period other comprehensive income, net of tax of $(447), $4, $(203), $(646)
647

 
(7
)
 
296

 
936

Ending balance as of March 31, 2013
$
5,248

 
$
34

 
$
(15,034
)
 
$
(9,752
)
(1)
Reclassified to gas purchases in the Unaudited Consolidated Statements of Operations.
(2)
Included in the computation of net periodic pension cost, a component of operations and maintenance expense in the Unaudited Consolidated Statements of Operations.