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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
 12 Months Ended 36 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
site
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2007
Sep. 30, 2005
Nov. 26, 2013
Subsequent Event [Member]
Sep. 30, 2013
Three-year period ending September 30, 2016 [Member]
Sep. 30, 2013
From October 1, 2016 [Member]
Sep. 30, 2013
MF Global Inc [Member]
Jun. 30, 2010
Laclede Gas [Member]
Sep. 30, 2013
Missouri Gas Energy (MGE) [Member]
Sep. 30, 2013
Vehicles and Power Operated Equipment Leases [Member]
Laclede Gas [Member]
Commitments [Abstract]                          
Estimated capital expenditures, next fiscal year   $ 175,000,000                      
Approximate contract amount of project   1,500,000                      
Estimated capital expenditures for non-regulated subsidiaries   10,000,000                      
Minimum total payments required for natural gas contracts   981,000,000                      
Leases and Guarantees [Abstract]                          
Additional years available for lease renewal (in years)   5 years                      
Office headquarters lease rental aggregate expense   1,000,000 900,000 900,000               600,000  
Annual minimum rental payments 1,000,000                        
Minimum rental costs obligations - current fiscal year                         2,700,000
Minimum rental costs obligations - due in two years                         1,800,000
Minimum rental costs obligations - due in three years                         1,000,000
Minimum rental costs obligations - due in four years                         400,000
Minimum rental costs obligations - due in five years                         100,000
Outstanding mortgage loans incurred in connection with various real estate ventures with general partners   1,600,000                      
Contingencies and Indemnifications [Abstract]                          
Number of former manufactured gas plant (MGP) sites in Missouri   3                      
Number of former manufactured gas plant (MGP) sites in Shrewsbury, Missouri   1                      
Number of former manufactured gas plant (MGP) sites in the City of St. Louis   2                      
Minimum cost estimate for a one-time contractual transfer of risk           5,800,000              
Maximum cost estimate for a one-time contractual transfer of risk           36,300,000              
Original proposed disallowance amount related to recovery of purchased gas costs         6,000,000                
Revenue sharing agreements, Company's net margin amount subject to reduced sharing percentage   2,000,000                      
Revenue sharing agreements, Company's net margin amount subject to reduced sharing percentage, Company's percentage share   15.00%           0.00% 15.00%        
Notice of employment related violations issued to company, applicable period                     2 years    
Amount remaining on deposit with a brokerage firm for Laclede Gas             200,000            
Amount remaining on deposit with a brokerage firm for Laclede Energy Resources, Inc.             100,000            
Percentage of deposits recovered from bankrupt entity                   $ 0.98