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INTERIM FINANCIAL INFORMATION (UNAUDITED) (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Total Operating Revenues $ 147,114 [1] $ 165,289 $ 397,613 $ 307,003 $ 169,538 $ 186,849 $ 358,175 $ 410,913 $ 1,017,019 $ 1,125,475 $ 1,603,307
Operating Income (Loss) (9,722) [1] 12,282 51,849 42,085 1,869 15,045 50,583 43,105 96,494 110,602 118,247
Net Income (Loss) $ (9,636) [1] $ 6,584 $ 30,242 $ 25,568 $ (651) $ 8,433 $ 29,684 $ 25,174 $ 52,758 $ 62,640 $ 63,825
Basic Earnings (Loss) Per Share of Common Stock (in dollars per share) $ (0.30) [1] $ 0.25 $ 1.34 $ 1.14 $ (0.03) $ 0.38 $ 1.33 $ 1.13 $ 2.03 $ 2.80 $ 2.87
Diluted Earnings (Loss) Per Share of Common Stock (in dollars per share) $ (0.30) [1] $ 0.25 $ 1.34 $ 1.14 $ (0.03) $ 0.38 $ 1.32 $ 1.12 $ 2.02 $ 2.79 $ 2.86
[1] All quarters of 2013 reflect transaction costs incurred associated with the acquisition of MGE. The fourth quarter of 2013 includes one month of activity of the operations of MGE, significant transaction costs incurred in the quarter and the interest impact of the debt issued in the quarter. Total impact of all of these during the quarter was a decrease in net income of $5.5 million.