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Note 14 - Information by Operating Segment - Segment Information by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Revenues from external customers $ 2,198.5 $ 2,235.5 $ 1,855.4
Intersegment revenues 0.0 0.0 0.0
Operating Revenues 2,198.5 2,235.5 1,855.4
Natural gas 923.9 946.3 696.1
Operation and maintenance 449.6 465.8 458.6
Depreciation and amortization 237.3 213.1 197.3
Taxes, other than income taxes 179.5 160.1 148.4
Total Operating Expenses 1,790.3 1,785.3 1,649.0
Operating Income 408.2 450.2 206.4
Net Economic Earnings (Loss) 216.3 266.3 207.8
Capital Expenditures 552.2 624.8 638.4
Impairments 0.0 0.0 148.6
Intersegment Eliminations [Member]      
Revenues from external customers 0.0 0.0 0.0
Intersegment revenues (51.7) (48.0) (42.3)
Operating Revenues (51.7) (48.0) (42.3)
Natural gas (36.3) (34.3) (29.6)
Operation and maintenance (15.4) (13.7) (12.7)
Depreciation and amortization 0.0 0.0 0.0
Taxes, other than income taxes 0.0 0.0 0.0
Total Operating Expenses (51.7) (48.0) (42.3)
Operating Income 0.0 0.0 0.0
Net Economic Earnings (Loss) 0.0 0.0 0.0
Capital Expenditures (0.6) 0.0 0.0
Impairments     0.0
Gas Utility [Member] | Operating Segments [Member]      
Revenues from external customers 1,945.6 2,118.2 1,751.8
Intersegment revenues 0.5 1.1 0.2
Operating Revenues 1,946.1 2,119.3 1,752.0
Natural gas 788.8 961.7 660.2
Operation and maintenance 413.3 422.2 421.3
Depreciation and amortization 227.9 204.4 189.7
Taxes, other than income taxes 176.2 157.0 146.5
Total Operating Expenses 1,606.2 1,745.3 1,417.7
Operating Income 339.9 374.0 334.3
Net Economic Earnings (Loss) 202.7 230.6 213.4
Capital Expenditures 528.6 590.4 547.8
Impairments     0.0
Gas Marketing [Member] | Operating Segments [Member]      
Revenues from external customers 234.9 96.5 87.9
Intersegment revenues 0.0 0.0 0.0
Operating Revenues 234.9 96.5 87.9
Natural gas 171.4 18.8 65.1
Operation and maintenance 14.6 17.1 11.8
Depreciation and amortization 1.4 1.2 0.6
Taxes, other than income taxes 0.6 0.9 1.1
Total Operating Expenses 188.0 38.0 78.6
Operating Income 46.9 58.5 9.3
Net Economic Earnings (Loss) 27.0 47.0 9.1
Capital Expenditures 0.9 0.7 3.6
Impairments     0.0
Midstream [Member] | Operating Segments [Member]      
Revenues from external customers 17.4 19.9 14.9
Intersegment revenues 35.7 32.7 28.2
Operating Revenues 53.1 52.6 43.1
Natural gas 0.0 0.0 0.3
Operation and maintenance 22.2 24.2 21.9
Depreciation and amortization 7.5 6.9 6.5
Taxes, other than income taxes 2.6 2.0 1.0
Total Operating Expenses 32.3 33.1 170.5
Operating Income 20.8 19.5 (127.4)
Net Economic Earnings (Loss) 11.1 11.1 5.9
Capital Expenditures 23.3 33.0 86.3
Impairments     140.8
Other Segments [Member] | Operating Segments [Member]      
Revenues from external customers 0.6 0.9 0.8
Intersegment revenues 15.5 14.2 13.9
Operating Revenues 16.1 15.1 14.7
Natural gas 0.0 0.1 0.1
Operation and maintenance 14.9 16.0 16.3
Depreciation and amortization 0.5 0.6 0.5
Taxes, other than income taxes 0.1 0.2 (0.2)
Total Operating Expenses 15.5 16.9 24.5
Operating Income 0.6 (1.8) (9.8)
Net Economic Earnings (Loss) (24.5) (22.4) (20.6)
Capital Expenditures $ 0.0 $ 0.7 0.7
Impairments     $ 7.8