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STATEMENTS OF CONSOLIDATED INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Operating Revenues:      
Gas Utility $ 847,224 $ 763,447 $ 913,190
Gas Marketing 165,146 358,145 669,375
Other 4,649 3,883 20,742
Total Operating Revenues 1,017,019 1,125,475 1,603,307
Gas Utility      
Natural and propane gas 433,442 397,304 549,947
Other operation and maintenance expenses 180,342 167,351 172,938
Depreciation and amortization 48,283 40,739 39,214
Taxes, other than income taxes 60,079 53,672 60,752
Total Gas Utility Operating Expenses 722,146 659,066 822,851
Gas Marketing 176,554 353,283 652,567
Other 21,825 2,524 9,642
Total Operating Expenses 920,525 1,014,873 1,485,060
Operating Income 96,494 110,602 118,247
Other Income and (Income Deductions) – Net 2,444 3,272 177
Interest Charges:      
Interest on long-term debt 25,539 22,958 23,161
Other interest charges 3,063 1,987 2,256
Total Interest Charges 28,602 24,945 25,417
Income Before Income Taxes 70,336 88,929 93,007
Income Tax Expense 17,578 26,289 29,182
Net Income $ 52,758 $ 62,640 $ 63,825
Weighted Average Number of Common Shares Outstanding:      
Basic (in shares) 25,875 22,262 22,099
Diluted (in shares) 25,952 22,340 22,171
Basic Earnings Per Share of Common Stock (in dollars per share) $ 2.03 $ 2.80 $ 2.87
Diluted Earnings Per Share of Common Stock (in dollars per share) $ 2.02 $ 2.79 $ 2.86