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NOTES PAYABLE AND CREDIT AGREEMENTS (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Laclede Gas [Member]
Line of Credit [Member]
Sep. 03, 2013
Laclede Gas [Member]
Line of Credit [Member]
bank
Sep. 30, 2013
Laclede Group [Member]
Line of Credit [Member]
Sep. 03, 2013
Laclede Group [Member]
Line of Credit [Member]
Sep. 30, 2013
Laclede Group [Member]
Commercial Paper [Member]
Sep. 30, 2012
Laclede Group [Member]
Commercial Paper [Member]
Line of Credit Facility [Line Items]                
Line of credit facility borrowing capacity       $ 450,000,000   $ 150,000,000    
Banks in syndicated line of credit facility       9        
Banks in syndicated line of credit facility, largest borrowing portion provided by a single bank       15.60%        
Minimum required ratio of earnings before interest, taxes, depreciation, and amortization (EBITDA) times interest expense as required by the line of credit covenant.       70.00%   70.00%    
Debt to total capitalization ratio     48.00%   49.00%      
Weighted average borrowings outstanding             34,200,000 43,800,000
Weighted average interest rate             0.30% 0.30%
Short term borrowings outstanding in the period - minimum             0 0
Short term borrowings outstanding in the period - maximum             99,400,000 133,500,000
Borrowings outstanding at end of period $ 74,000,000 $ 40,100,000         $ 74,000,000 $ 40,100,000
Weighted average interest rate at period end             0.30% 0.20%