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STOCKHOLDER'S EQUITY (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
May 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2013
Sep. 30, 2013
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Sep. 30, 2012
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Sep. 30, 2013
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
Sep. 30, 2012
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
Nov. 26, 2013
Subsequent Event [Member]
Aug. 13, 2013
Laclede Gas [Member]
Sep. 30, 2013
Laclede Gas [Member]
Nov. 26, 2013
Laclede Gas [Member]
Subsequent Event [Member]
Accumulated other comprehensive income (loss), net of income taxes [Line Items]                          
Common stock, issued (in shares)   32,700,000 22,540,000                    
Increase in common stock and paid-in capital   $ 435,800,000 $ 5,000,000                    
Shares issued - dividend reinvestment plan and stock purchase plan (in shares)   44,074 46,107                    
Shares issued - dividend reinvestment plan and stock purchase plan   1,847,000 1,841,000 1,614,000                  
Shares issued - Equity plan and stock-based compensation costs   434,000,000 3,200,000                    
Stock Issued During Period, Shares, Share-based Compensation, Gross 10,005,000                        
Shares issued - Equity plan and stock-based compensation costs (in shares)   108,331 62,590                    
Dividend payment restriction formula component - fixed amount   8,000,000                      
Dividend payment restriction formula resulting calculation - available to pay dividends in period   833,000,000 355,000,000                    
SEC effective shelf registration Form S-3 sale and issuance authorization under the dividend reinvestment and stock purchase program (in shares)   285,222                      
SEC effective shelf registration Form S-3 remaining and available for issuance under the dividend reinvestment and stock purchase program (in shares)   194,246               186,919      
Issuance of first mortgage bonds   550,000,000 0 0             450,000,000    
MoPSC authorized debt issuance through June 30, 2013 - maximum available         518,000,000             518,000,000  
Extension period for debt securities and preferred stock issuance authority   2 years                   2 years  
MoPSC authorized debt issuance - remaining available   370,800,000                     370,800,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                          
Balance, beginning balance   (4,116,000) (2,100,000)     (1,886,000) 320,000 (2,230,000) (2,420,000)        
Current-period change   3,329,000 (2,016,000) 5,037,000   3,281,000 (2,206,000) 48,000 190,000        
Balance, ending balance   $ (787,000) $ (4,116,000) $ (2,100,000)   $ 1,395,000 $ (1,886,000) $ (2,182,000) $ (2,230,000)