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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     $ (1,621) $ (10,771)
Other comprehensive (loss), before reclassifications, net of tax     (586) 282
Amounts reclassified from accumulated other comprehensive income, net of tax     427 737
Other comprehensive income (loss) 24 936 (159) 1,019
Balance as of end of period (1,780) (9,752) (1,780) (9,752)
Tax on other comprehensive income before reclassifications     372 (200)
Tax on amounts reclassified from accumulated other comprehensive income     (283) (422)
Tax on net current-period other comprehensive income     89 (622)
Available for Sale Securities [Member]
        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     5,400 4,921
Other comprehensive (loss), before reclassifications, net of tax     (295) 327
Amounts reclassified from accumulated other comprehensive income, net of tax     0 0
Other comprehensive income (loss)     (295) 327
Balance as of end of period 5,105 5,248 5,105 5,248
Tax on other comprehensive income before reclassifications     203 (226)
Tax on amounts reclassified from accumulated other comprehensive income     0 0
Tax on net current-period other comprehensive income     203 (226)
Cash Flow Hedges [Member]
        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     12 51
Other comprehensive (loss), before reclassifications, net of tax     (291) (45)
Amounts reclassified from accumulated other comprehensive income, net of tax     105 [1] 28 [1]
Other comprehensive income (loss)     (186) (17)
Balance as of end of period (174) 34 (174) 34
Tax on other comprehensive income before reclassifications     169 26
Tax on amounts reclassified from accumulated other comprehensive income     (60) (16)
Tax on net current-period other comprehensive income     109 10
Postemployment Benefit Obligation [Member]
        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     (7,033) (15,743)
Other comprehensive (loss), before reclassifications, net of tax     0 0
Amounts reclassified from accumulated other comprehensive income, net of tax     322 [2] 709 [2]
Other comprehensive income (loss)     322 709
Balance as of end of period (6,711) (15,034) (6,711) (15,034)
Tax on other comprehensive income before reclassifications     0 0
Tax on amounts reclassified from accumulated other comprehensive income     (223) (406)
Tax on net current-period other comprehensive income     $ (223) $ (406)
[1] Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases in the Unaudited Condensed Consolidated Statements of Operations.
[2] Included in the computation of net periodic pension cost, a component of operations and maintenance expense in the Unaudited Condensed Consolidated Statements of Operations.