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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]  
Schedule of Utility Inventory
The following table summarizes gas in storage, at average cost by company as of:
 
June 30,
2013
September 30,
2012
($ in thousands)
Gas in Storage
 
Bcf (1)
Gas in Storage
 
Bcf (1)
NJNG
 
$
63,900

12.3

 
$
145,379

22.2

NJRES
 
216,218

56.3

 
119,814

45.5

Total
 
$
280,118

68.6

 
$
265,193

67.7


(1)
Billion cubic feet (Bcf).
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(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 $(611), $(4), $-, $(615)
885

 
6

 
—

 
891

Amounts reclassified from accumulated other comprehensive income, net of tax of $155, $21 $(405), $(229)
(225
)
(1) 
(40
)
(2) 
592

(3) 
327

Net current-period other comprehensive income, net of tax of $(456), $17, $(405), $(844)
660

 
(34
)
 
592

 
1,218

Ending balance as of June 30, 2013
$
5,261

 
$
7

 
$
(14,738
)
 
$
(9,470
)
(1)
Reclassified to other income in the Unaudited Consolidated Statements of Operations.
(2)
Reclassified to gas purchases in the Unaudited Consolidated Statements of Operations.
(3)
Included in the computation of net periodic pension cost, a component of operations and maintenance expense in the Unaudited Consolidated Statements of Operations.