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INFORMATION BY OPERATING SEGMENT (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
subsidiary
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
subsidiary
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting [Abstract]                      
Number of entity subsidiaries 7               7    
Amount of depreciation and amortization for Non-Regulated Gas Marketing included in Non-Regulated Gas Marketing Expenses on the Statements of Consolidated Income                 $ 300,000 $ 300,000 $ 100,000
Amount of depreciation, amortization, and accretion for Other included in Other Operating Expenses on the Statements of Consolidated Income                 600,000 300,000 200,000
After-tax earnings resulting from the non-regulated sale of propane inventory                     6,100,000
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings                      
Net income (9,636,000) [1] 6,584,000 30,242,000 25,568,000 (651,000) 8,433,000 29,684,000 25,174,000 52,758,000 62,640,000 63,825,000
Unrealized loss (gain) on energy-related derivatives                 614,000 (314,000) (1,415,000)
Lower of cost or market inventory adjustments                 868,000 0 0
Realized (gain) loss on economic hedges prior to the sale of the physical commodity                 (25,000) 163,000 0
Acquisition, divestiture and restructuring activities                 10,797,000 123,000 0
Net Economic Earnings (Non-GAAP)                 65,012,000 62,612,000 62,410,000
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 1,017,019,000 1,125,475,000 1,576,360,000
Total Operating Revenues 147,114,000 [1] 165,289,000 397,613,000 307,003,000 169,538,000 186,849,000 358,175,000 410,913,000 1,017,019,000 1,125,475,000 1,603,307,000
Gas Utility                      
Natural and propane gas                 433,442,000 397,304,000 549,947,000
Other operation and maintenance expenses                 180,342,000 167,351,000 172,938,000
Depreciation & amortization                 48,283,000 40,739,000 39,214,000
Taxes, other than income taxes                 60,079,000 53,672,000 60,752,000
Total Gas Utility Operating Expenses                 722,146,000 659,066,000 822,851,000
Gas Marketing                 176,554,000 353,283,000 652,567,000
Other                 21,825,000 2,524,000 9,642,000
Costs and Expenses                 920,525,000 1,014,873,000 1,485,060,000
Operating Income (9,722,000) [1] 12,282,000 51,849,000 42,085,000 1,869,000 15,045,000 50,583,000 43,105,000 96,494,000 110,602,000 118,247,000
Interest income                 1,088,000 1,309,000 1,136,000
Interest charges                 28,602,000 24,945,000 25,417,000
Income Tax Expense                 17,578,000 26,289,000 29,182,000
Net Economic Earnings (Non-GAAP)                 65,012,000 62,612,000 62,410,000
Total assets 3,125,386,000       1,880,262,000       3,125,386,000 1,880,262,000 1,783,082,000
Capital expenditures                 130,788,000 108,843,000 67,638,000
Intersegment Revenues [Member]
                      
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 0 0 26,947,000
Gas Utility [Member]
                      
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings                      
Net Economic Earnings (Non-GAAP)                 56,635,000 48,089,000 46,952,000
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 847,224,000 763,447,000 911,614,000
Total Operating Revenues                 857,762,000 764,651,000 913,190,000
Gas Utility                      
Natural and propane gas                 469,098,000 414,846,000 549,947,000
Other operation and maintenance expenses                 180,702,000 167,351,000 172,938,000
Depreciation & amortization                 48,283,000 40,739,000 39,214,000
Taxes, other than income taxes                 60,079,000 53,672,000 60,752,000
Total Gas Utility Operating Expenses                 758,162,000 676,608,000 822,851,000
Gas Marketing                 0 0 0
Other                 0 0 0
Costs and Expenses                 758,162,000 676,608,000 822,851,000
Operating Income                 99,599,000 88,043,000 90,339,000
Interest income                 947,000 1,230,000 1,057,000
Interest charges                 26,137,000 25,156,000 25,544,000
Income Tax Expense                 19,243,000 17,393,000 18,694,000
Net Economic Earnings (Non-GAAP)                 56,635,000 48,089,000 46,952,000
Total assets 2,981,016,000       1,758,952,000       2,981,016,000 1,758,952,000 1,641,386,000
Capital expenditures                 128,496,000 106,734,000 67,304,000
Gas Utility [Member] | Intersegment Revenues [Member]
                      
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 10,538,000 1,204,000 1,576,000
Gas Marketing [Member]
                      
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings                      
Net Economic Earnings (Non-GAAP)                 8,936,000 12,273,000 8,962,000
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 165,146,000 358,145,000 645,042,000
Total Operating Revenues                 189,331,000 373,475,000 669,375,000
Gas Utility                      
Natural and propane gas                 0 0 0
Other operation and maintenance expenses                 0 0 0
Depreciation & amortization                 0 0 0
Taxes, other than income taxes                 0 0 0
Total Gas Utility Operating Expenses                 0 0 0
Gas Marketing                 176,554,000 [2] 353,286,000 [2] 652,567,000 [2]
Other                 0 0 0
Costs and Expenses                 176,554,000 353,286,000 652,567,000
Operating Income                 12,777,000 20,189,000 16,808,000
Interest income                 103,000 175,000 165,000
Interest charges                 135,000 81,000 14,000
Income Tax Expense                 5,162,000 7,966,000 6,570,000
Net Economic Earnings (Non-GAAP)                 8,936,000 12,273,000 8,962,000
Total assets 163,944,000       190,709,000       163,944,000 190,709,000 175,352,000
Capital expenditures                 44,000 140,000 215,000
Gas Marketing [Member] | Intersegment Revenues [Member]
                      
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 24,185,000 15,330,000 24,333,000
Other [Member]
                      
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings                      
Net Economic Earnings (Non-GAAP)                 (559,000) 2,250,000 6,496,000 [3]
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 4,649,000 3,883,000 19,704,000
Total Operating Revenues                 6,274,000 4,925,000 20,742,000
Gas Utility                      
Natural and propane gas                 0 0 0
Other operation and maintenance expenses                 0 0 0
Depreciation & amortization                 0 0 0
Taxes, other than income taxes                 0 0 0
Total Gas Utility Operating Expenses                 0 0 0
Gas Marketing                 0 0 0
Other                 22,157,000 [4] 2,555,000 [4] 9,642,000 [4]
Costs and Expenses                 22,157,000 2,555,000 9,642,000
Operating Income                 (15,882,000) 2,370,000 11,100,000
Interest income                 343,000 371,000 217,000
Interest charges                 2,635,000 175,000 162,000
Income Tax Expense                 (6,827,000) 930,000 3,918,000
Net Economic Earnings (Non-GAAP)                 (559,000) 2,250,000 6,496,000 [3]
Total assets 115,560,000       102,241,000       115,560,000 102,241,000 129,176,000
Capital expenditures                 2,248,000 1,969,000 119,000
Other [Member] | Intersegment Revenues [Member]
                      
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 1,625,000 1,042,000 1,038,000
Eliminations [Member]
                      
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings                      
Net Economic Earnings (Non-GAAP)                 0 0 0
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 0 0 0
Total Operating Revenues                 (36,348,000) (17,576,000) 0
Gas Utility                      
Natural and propane gas                 (35,656,000) (17,542,000) 0
Other operation and maintenance expenses                 (360,000) 0 0
Depreciation & amortization                 0 0 0
Taxes, other than income taxes                 0 0 0
Total Gas Utility Operating Expenses                 (36,016,000) (17,542,000) 0
Gas Marketing                 0 (3,000) 0
Other                 (332,000) (31,000) 0
Costs and Expenses                 (36,348,000) (17,576,000) 0
Operating Income                 0 0 0
Interest income                 (305,000) (467,000) (303,000)
Interest charges                 (305,000) (467,000) (303,000)
Income Tax Expense                 0 0 0
Net Economic Earnings (Non-GAAP)                 0 0 0
Total assets (135,134,000)       (171,640,000)       (135,134,000) (171,640,000) (162,832,000)
Capital expenditures                 0 0 0
Eliminations [Member] | Intersegment Revenues [Member]
                      
Operating Segment Information [Abstract]                      
Total revenues including intersegment revenues                 $ (36,348,000) $ (17,576,000) $ 0
[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.
[2] Depreciation and amortization for Gas Marketing is included in Gas Marketing Expenses on the Statements of Consolidated Income ($0.3 million for fiscal year 2013, $0.3 million for fiscal year 2012, and $0.1 million for fiscal year 2011).
[3] Net economic earnings include income realized by the Utility from separate non-regulated sales of propane inventory no longer needed to serve utility customers, of which occurred in fiscal year 2011. This transaction resulted in after-tax earnings totaling $6.1 million.
[4] Depreciation, amortization, and accretion for Other is included in the Other Operating Expenses on the Statements of Consolidated Income ($0.6 million for fiscal year 2013, $0.3 million for fiscal year 2012 and $0.2 million for fiscal year 2011).