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FAIR VALUE MEASUREMENTS (Details) (Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
ASSETS    
Total $ 22.7 $ 17.8
LIABILITIES    
Total 4.5 5.9
Quoted Prices in Active Markets (Level 1)
    
ASSETS    
Total 19.1 18.9
LIABILITIES    
Total 6.5 3.7
Significant Observable Inputs (Level 2)
    
ASSETS    
Total 7.9 1.7
LIABILITIES    
Total 5.5 6.9
Significant Unobservable Inputs (Level 3)
    
ASSETS    
Total 0.2 0.2
LIABILITIES    
Total 0 0
Effects of Netting and Cash Margin Receivables /Payables
    
ASSETS    
Total (4.5) (3.0)
LIABILITIES    
Total (7.5) (4.7)
Gas Utility
    
ASSETS    
U. S. Stock/Bond Mutual Funds 19.6 14.5
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts 0 0
Total 19.6 14.5
LIABILITIES    
NYMEX/ICE natural gas contracts 0 0
OTCBB natural gas contracts 4.0 5.2
NYMEX gasoline and heating oil contracts 0  
Total 4.0 5.2
Gas Utility | Quoted Prices in Active Markets (Level 1)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 15.7 14.5
NYMEX natural gas contracts 2.4 1.5
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts 0 0.1
Total 18.1 16.1
LIABILITIES    
NYMEX/ICE natural gas contracts 5.2 3.5
OTCBB natural gas contracts 0 0
NYMEX gasoline and heating oil contracts 0.2  
Total 5.4 3.5
Gas Utility | Significant Observable Inputs (Level 2)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 3.9 0
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0.1 0.2
Gasoline and heating oil contracts 0 0
Total 4.0 0.2
LIABILITIES    
NYMEX/ICE natural gas contracts 0 0
OTCBB natural gas contracts 4.1 5.4
NYMEX gasoline and heating oil contracts 0  
Total 4.1 5.4
Gas Utility | Significant Unobservable Inputs (Level 3)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 0 0
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts 0 0
Total 0 0
LIABILITIES    
NYMEX/ICE natural gas contracts 0  
OTCBB natural gas contracts 0 0
NYMEX gasoline and heating oil contracts 0  
Total 0 0
Gas Utility | Effects of Netting and Cash Margin Receivables /Payables
    
ASSETS    
U. S. Stock/Bond Mutual Funds 0 0
NYMEX natural gas contracts (2.4) (1.5)
OTCBB natural gas contracts (0.1) (0.2)
Gasoline and heating oil contracts 0 (0.1)
Total (2.5) (1.8)
LIABILITIES    
NYMEX/ICE natural gas contracts (5.2) (3.5)
OTCBB natural gas contracts (0.1) (0.2)
NYMEX gasoline and heating oil contracts (0.2)  
Total (5.5) (3.7)
Gas Marketing
    
ASSETS    
NYMEX natural gas contracts 0.4 3.3
Natural gas commodity contracts 2.7  
LIABILITIES    
NYMEX natural gas contracts 0 0.7
Natural gas commodity contracts 0.5  
Gas Marketing | Quoted Prices in Active Markets (Level 1)
    
ASSETS    
NYMEX natural gas contracts 1.0 2.8
Natural gas commodity contracts 0  
LIABILITIES    
NYMEX natural gas contracts 1.1 0.2
Natural gas commodity contracts 0  
Gas Marketing | Significant Observable Inputs (Level 2)
    
ASSETS    
NYMEX natural gas contracts 1.2 1.5
Natural gas commodity contracts 2.7  
LIABILITIES    
NYMEX natural gas contracts 0.7 1.5
Natural gas commodity contracts 0.7  
Gas Marketing | Significant Unobservable Inputs (Level 3)
    
ASSETS    
NYMEX natural gas contracts 0 0.2
Natural gas commodity contracts 0.2  
LIABILITIES    
NYMEX natural gas contracts 0 0
Natural gas commodity contracts 0  
Gas Marketing | Effects of Netting and Cash Margin Receivables /Payables
    
ASSETS    
NYMEX natural gas contracts (1.8) (1.2)
Natural gas commodity contracts (0.2)  
LIABILITIES    
NYMEX natural gas contracts (1.8) (1.0)
Natural gas commodity contracts (0.2)  
Laclede Gas
    
ASSETS    
U. S. Stock/Bond Mutual Funds 19.6 14.5
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts   0
Total 19.6 14.5
LIABILITIES    
NYMEX/ICE natural gas contracts 0 0
OTCBB natural gas contracts 4.0 5.2
NYMEX gasoline and heating oil contracts 0  
Total 4.0 5.2
Laclede Gas | Quoted Prices in Active Markets (Level 1)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 15.7 14.5
NYMEX natural gas contracts 2.4 1.5
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts   0.1
Total 18.1 16.1
LIABILITIES    
NYMEX/ICE natural gas contracts 5.2 3.5
OTCBB natural gas contracts 0 0
NYMEX gasoline and heating oil contracts 0.2  
Total 5.4 3.5
Laclede Gas | Significant Observable Inputs (Level 2)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 3.9 0
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0.1 0.2
Gasoline and heating oil contracts   0
Total 4.0 0.2
LIABILITIES    
NYMEX/ICE natural gas contracts 0 0
OTCBB natural gas contracts 4.1 5.4
NYMEX gasoline and heating oil contracts 0  
Total 4.1 5.4
Laclede Gas | Significant Unobservable Inputs (Level 3)
    
ASSETS    
U. S. Stock/Bond Mutual Funds 0 0
NYMEX natural gas contracts 0 0
OTCBB natural gas contracts 0 0
Gasoline and heating oil contracts   0
Total 0 0
LIABILITIES    
NYMEX/ICE natural gas contracts 0 0
OTCBB natural gas contracts 0 0
NYMEX gasoline and heating oil contracts 0  
Total 0 0
Laclede Gas | Effects of Netting and Cash Margin Receivables /Payables
    
ASSETS    
U. S. Stock/Bond Mutual Funds 0 0
NYMEX natural gas contracts (2.4) (1.5)
OTCBB natural gas contracts (0.1) (0.2)
Gasoline and heating oil contracts   (0.1)
Total (2.5) (1.8)
LIABILITIES    
NYMEX/ICE natural gas contracts (5.2) (3.5)
OTCBB natural gas contracts (0.1) (0.2)
NYMEX gasoline and heating oil contracts (0.2)  
Total $ (5.5) $ (3.7)