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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period $ (1,621) $ (10,771)  
Other comprehensive (loss), before reclassifications, net of tax of $426 $159, $3,334, $3,919 (5,897) 8,201  
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(98), $(1,172), $(1,270) 1,924 949  
Other comprehensive (loss) income (3,973) 9,150 (167)
Balance at end of period (5,594) (1,621) (10,771)
Tax on other comprehensive income before reclassifications 3,919 (5,593)  
Tax on amounts reclassified from accumulated other comprehensive income (1,270) (648)  
Tax on net current-period other comprehensive income 2,649 (6,241)  
Unrealized Gain on Available for Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period 5,400 4,921  
Other comprehensive (loss), before reclassifications, net of tax of $426 $159, $3,334, $3,919 (618) 703  
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(98), $(1,172), $(1,270) 0 [1] (224) [1]  
Other comprehensive (loss) income (618) 479  
Balance at end of period 4,782 5,400  
Tax on other comprehensive income before reclassifications 426 (485)  
Tax on amounts reclassified from accumulated other comprehensive income 0 155  
Tax on net current-period other comprehensive income 426 (330)  
Net Unrealized Gain on Derivatives [Member]
      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period 12 51  
Other comprehensive (loss), before reclassifications, net of tax of $426 $159, $3,334, $3,919 (273) (28)  
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(98), $(1,172), $(1,270) 168 [2] (11) [2]  
Other comprehensive (loss) income (105) (39)  
Balance at end of period (93) 12  
Tax on other comprehensive income before reclassifications 159 16  
Tax on amounts reclassified from accumulated other comprehensive income (98) 7  
Tax on net current-period other comprehensive income 61 23  
Adjustment to Postemployment Benefit Obligation [Member]
      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (7,033) (15,743)  
Other comprehensive (loss), before reclassifications, net of tax of $426 $159, $3,334, $3,919 (5,006) 7,526  
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(98), $(1,172), $(1,270) 1,756 [3] 1,184 [3]  
Other comprehensive (loss) income (3,250) 8,710  
Balance at end of period (10,283) (7,033)  
Tax on other comprehensive income before reclassifications 3,334 (5,124)  
Tax on amounts reclassified from accumulated other comprehensive income (1,172) (810)  
Tax on net current-period other comprehensive income $ 2,162 $ (5,934)  
[1] Reclassified to other income in the Consolidated Statements of Operations.
[2] Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases in the Consolidated Statements of Operations.
[3] Included in the computation of net periodic pension cost, a component of O&M expense in the Consolidated Statements of Operations.