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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
OPERATING REVENUES      
Utility $ 781,970 $ 819,415 $ 787,987
Nonutility 1,952,017 2,918,730 2,410,081
Total operating revenues 2,733,987 3,738,145 3,198,068
Gas purchases:      
Utility 304,953 319,897 400,307
Nonutility 1,767,841 2,807,008 2,299,974
Related parties 12,851 12,620 11,942
Operation and maintenance 209,453 215,180 173,473
Regulatory rider expenses 75,779 72,164 48,417
Depreciation and amortization 61,399 52,742 47,310
Energy and other taxes 53,260 57,344 57,414
Total operating expenses 2,485,536 3,536,955 3,038,837
OPERATING INCOME 248,451 201,190 159,231
Other income, net 6,545 7,551 4,783
Interest expense, net of capitalized interest 27,721 25,463 23,979
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES 227,275 183,278 140,035
Income tax provision 59,724 51,840 35,575
Equity in earnings of affiliates 13,409 10,532 10,349
NET INCOME $ 180,960 $ 141,970 $ 114,809
EARNINGS PER COMMON SHARE      
Basic (in usd per share) $ 2.12 $ 1.69 $ 1.38
Diluted (in usd per share) [1] 2.10 1.67 1.37
DIVIDENDS DECLARED PER COMMON SHARE (in usd per share) $ 0.915 $ 0.855 $ 0.81
WEIGHTED AVERAGE SHARES OUTSTANDING      
Basic (in shares) 85,186 84,198 83,316
Diluted (in shares) 86,265 84,922 83,628
[1] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for fiscal 2015, 2014 and 2013.