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Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Revenues $ 756.6 $ 814.0
Consolidation, Eliminations [Member]    
Operating Revenues (13.9) (12.3)
Gas Utility [Member] | Operating Segments [Member]    
Operating Revenues 715.2 733.0
Gas Marketing [Member] | Operating Segments [Member]    
Operating Revenues 36.3 74.1
Midstream [Member] | Operating Segments [Member]    
Operating Revenues 14.9 15.2
Other Segments [Member] | Consolidation, Eliminations [Member]    
Operating Revenues 4.1 4.0
Spire Missouri [Member]    
Operating Revenues 535.4 541.2
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member]    
Revenue 514.6 539.7
Changes in accrued revenue under alternative revenue programs 20.8 1.5
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]    
Revenue 388.8 400.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]    
Revenue 110.2 122.9
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]    
Revenue 9.0 9.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]    
Revenue 4.1 5.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]    
Revenue 2.5 2.0
Spire Alabama Inc [Member]    
Operating Revenues 142.1 152.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member]    
Revenue 143.1 152.8
Changes in accrued revenue under alternative revenue programs (1.0) (0.4)
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]    
Revenue 84.4 96.3
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]    
Revenue 34.7 33.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]    
Revenue 20.8 19.3
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]    
Revenue 2.3 2.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]    
Revenue 0.9 1.2
Spire [Member]    
Operating Revenues 756.6 814.0
Spire [Member] | Operating Segments [Member]    
Operating Revenues 770.5 826.3
Spire [Member] | Consolidation, Eliminations [Member]    
Operating Revenues (13.9)  
Spire [Member] | Segment Reconciling Items [Member]    
Operating Revenues   (12.3)
Spire [Member] | Gas Utility [Member] | Operating Segments [Member]    
Revenue 695.2 731.5
Changes in accrued revenue under alternative revenue programs 20.0 1.5
Total Gas Utility operating revenues 715.2 733.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]    
Revenue 492.8 518.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]    
Revenue 157.9 170.6
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]    
Revenue 32.6 30.9
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]    
Revenue 6.4 7.6
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]    
Revenue 5.5 4.4
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member]    
Unregulated Operating Revenue 36.3 74.1
Spire [Member] | Midstream [Member] | Operating Segments [Member]    
Unregulated Operating Revenue 14.9 15.2
Spire [Member] | Other Segments [Member] | Operating Segments [Member]    
Unregulated Operating Revenue $ 4.1 $ 4.0