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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period $ (5,594) $ (1,621)  
Other comprehensive (loss), before reclassifications, net of tax (5,136) (5,897)  
Amounts reclassified from accumulated other comprehensive income, net of tax 1,336 1,924  
Other comprehensive (loss) income (3,800) (3,973) $ 9,150
Balance at end of period (9,394) (5,594) (1,621)
Tax on other comprehensive income before reclassifications 3,373 3,919  
Tax on amounts reclassified from accumulated other comprehensive income (876) (1,270)  
Tax on net current-period other comprehensive income (loss) 2,497 2,649  
Unrealized Gain on Available for Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period 4,782 5,400  
Other comprehensive (loss), before reclassifications, net of tax 1,603 (618)  
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0  
Other comprehensive (loss) income 1,603 (618)  
Balance at end of period 6,385 4,782 5,400
Tax on other comprehensive income before reclassifications (1,135) 426  
Tax on amounts reclassified from accumulated other comprehensive income 0 0  
Tax on net current-period other comprehensive income (loss) (1,135) 426  
Net Unrealized Gain on Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (93) 12  
Other comprehensive (loss), before reclassifications, net of tax (256) (273)  
Amounts reclassified from accumulated other comprehensive income, net of tax [1] 349 168  
Other comprehensive (loss) income 93 (105)  
Balance at end of period 0 (93) 12
Tax on other comprehensive income before reclassifications 146 159  
Tax on amounts reclassified from accumulated other comprehensive income (202) (98)  
Tax on net current-period other comprehensive income (loss) (56) 61  
Adjustment to Postemployment Benefit Obligation [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (10,283) (7,033)  
Other comprehensive (loss), before reclassifications, net of tax (6,483) (5,006)  
Amounts reclassified from accumulated other comprehensive income, net of tax [2] 987 1,756  
Other comprehensive (loss) income (5,496) (3,250)  
Balance at end of period (15,779) (10,283) $ (7,033)
Tax on other comprehensive income before reclassifications 4,362 3,334  
Tax on amounts reclassified from accumulated other comprehensive income (674) (1,172)  
Tax on net current-period other comprehensive income (loss) $ 3,688 $ 2,162  
[1] Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases on the Consolidated Statements of Operations.
[2] Included in the computation of net periodic pension cost, a component of O&M expense on the Consolidated Statements of Operations. For more details, see Note 10. Employee Benefit Plans.