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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Part 1 (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2013
gal
MMBTU
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
Designated as Hedging Instrument [Member]
Sep. 30, 2012
Designated as Hedging Instrument [Member]
Sep. 30, 2013
Not Designated as Hedging Instrument [Member]
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
Sep. 30, 2013
NYMEX Natural Gas Contracts [Member]
Designated as Hedging Instrument [Member]
Derivative Instruments Assets [Member]
Sep. 30, 2013
NYMEX Natural Gas Contracts [Member]
Designated as Hedging Instrument [Member]
Other Deferred Charges [Member]
Sep. 30, 2012
NYMEX Natural Gas Contracts [Member]
Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Sep. 30, 2013
NYMEX Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Derivative Instruments Assets [Member]
Sep. 30, 2013
NYMEX Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Charges [Member]
Sep. 30, 2012
NYMEX Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Charges [Member]
Sep. 30, 2013
NYMEX Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Sep. 30, 2012
NYMEX Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Sep. 30, 2013
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Derivative Instruments Assets [Member]
Sep. 30, 2012
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Derivative Instruments Assets [Member]
Sep. 30, 2013
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Charges [Member]
Sep. 30, 2012
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Charges [Member]
Sep. 30, 2013
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Current Liabilities [Member]
Sep. 30, 2012
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Current Liabilities [Member]
Sep. 30, 2013
Natural Gas Commodity Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Credits [Member]
Sep. 30, 2013
OTCBB Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Current Liabilities [Member]
Sep. 30, 2013
OTCBB Natural Gas Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Deferred Credits [Member]
Sep. 30, 2013
NYMEX Gasoline and Heating Oil Contracts [Member]
Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Sep. 30, 2012
NYMEX Gasoline and Heating Oil Contracts [Member]
Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Sep. 30, 2012
NYMEX Gasoline and Heating Oil Contracts [Member]
Not Designated as Hedging Instrument [Member]
Accounts Receivable Other [Member]
Aug. 06, 2013
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Feb. 28, 2013
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Sep. 30, 2013
Laclede Gas Company [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2014 [Member]
Open Short Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2014 [Member]
NYMEX Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2014 [Member]
OTCBB Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2015 [Member]
Open Short Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2015 [Member]
NYMEX Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Gas Company [Member]
Fiscal 2015 [Member]
OTCBB Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2014 [Member]
Open Short Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2014 [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2014 [Member]
NYMEX Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2015 [Member]
Open Short Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2015 [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2015 [Member]
NYMEX Natural Gas Contracts [Member]
Open Long Futures Positions [Member]
MMBTU
Sep. 30, 2013
Laclede Energy Resources [Member]
Fiscal 2016 [Member]
Open Long Futures Positions [Member]
MMBTU
Aug. 13, 2013
Laclede Gas [Member]
Derivative [Line Items]                                                                                          
Maximum percentage of normal volumes hedged 70.00%                                                                                        
Maximum number of months normal volumes can be hedged (in months) 36 months                                                                                        
Gasoline futures contracts notional amount (in gallons) 300,000                                                                                        
Average price of gasoline futures contracts (dollars per gallon) $ 2.23                                                                                        
Notional amount of non-exchange traded natural gas commodity contracts (in MMBtu) 67,400,000                                                                                        
Notional amount of non-exchange traded natural gas commodity contracts to be settled during fiscal 2014 58,500,000                                                                                        
Notional amount of non-exchange traded natural gas commodity contracts to be settled during fiscal 2015 8,100,000                                                                                        
Notional amount of non-exchange traded natural gas commodity contracts to be settled during fiscal 2016 800,000                                                                                        
Expected pre-tax unrealized gain (loss) reclassifications into the Statements of Consolidated Income during the next twelve months (2,300,000)                                                                                        
MMBtu                                                             0 7,260,000 16,810,000 0 940,000 7,580,000   12,910,000 0 1,710,000 60,000 0 190,000 0  
Avg. Price Per MMBtu                                                             0.00 3.99 3.97 0.00 3.84 4.22   3.98 0.00 3.94 4.21 0.00 4.06 4.15  
Contract volumes of NYMEX natural gas option used to mitigate price risk (in MMBtu)                                                           23,600,000             0                
Derivative notional amount                                                         355,000,000                                
Gain (Loss) on Derivative Instruments, Net, Pretax                                                       20,800,000                                  
Issuance of first mortgage bonds 550,000,000 0 0                                                                                   450,000,000
Derivatives, Fair Value [Line Items]                                                                                          
Asset Derivatives 6,276,000 [1] 11,922,000 [1]   2,349,000 [1] 739,000 [1] 3,927,000 [1] 11,183,000 [1] 2,222,000 [1] 22,000 [1] 405,000 [1] 950,000 [1] 32,000 [1] 0 [1] 1,434,000 [1] 8,000,000 [1] 991,000 [1] 3,150,000 [1] 20,000 [1] 19,000 [1] 247,000 [1] 4,000 [1] 21,000 [1] 228,000 [1] 4,000 [1] 105,000 [1] 334,000 [1] 10,000 [1]                                    
Liability Derivatives 10,629,000 [1] 14,576,000   451,000 [1] 3,413,000 10,178,000 [1] 11,163,000 440,000 [1] 11,000 [1] 3,413,000 100,000 [1] 0 [1] 0 3,455,000 [1] 10,731,000 90,000 [1] 295,000 137,000 [1] 0 830,000 [1] 137,000 123,000 [1] 4,045,000 [1] 1,398,000 [1] 0 [1] 0 0                                    
Derivative instrument assets reconciliation [Abstract]                                                                                          
Fair value of asset derivatives presented above 6,276,000 [1] 11,922,000 [1]   2,349,000 [1] 739,000 [1] 3,927,000 [1] 11,183,000 [1] 2,222,000 [1] 22,000 [1] 405,000 [1] 950,000 [1] 32,000 [1] 0 [1] 1,434,000 [1] 8,000,000 [1] 991,000 [1] 3,150,000 [1] 20,000 [1] 19,000 [1] 247,000 [1] 4,000 [1] 21,000 [1] 228,000 [1] 4,000 [1] 105,000 [1] 334,000 [1] 10,000 [1]                                    
Fair value of cash margin receivables offset with derivatives 1,765,000 5,478,000                                                                                      
Netting of assets and liabilities with the same counterparty (4,739,000) (14,526,000)                                                                                      
Total 3,302,000 2,874,000                                                                                      
Derivative Instrument Assets, per Consolidated Balance Sheets:                                                                                          
Derivative instrument assets 3,291,000 2,855,000                                                                                      
Other deferred charges 11,000 19,000                                                                                      
Total 3,302,000 2,874,000                                                                                      
Fair value of liability derivatives presented above 10,629,000 [1] 14,576,000   451,000 [1] 3,413,000 10,178,000 [1] 11,163,000 440,000 [1] 11,000 [1] 3,413,000 100,000 [1] 0 [1] 0 3,455,000 [1] 10,731,000 90,000 [1] 295,000 137,000 [1] 0 830,000 [1] 137,000 123,000 [1] 4,045,000 [1] 1,398,000 [1] 0 [1] 0 0                                    
Fair value of cash margin payables offset with derivatives 6,000 83,000                                                                                      
Netting of assets and liabilities with the same counterparty (4,739,000) (14,526,000)                                                                                      
Derivative instrument liabilities, per Consolidated Balance Sheets 5,896,000 [2] 133,000 [2]                                                                                      
Other current liabilities 4,400,000 133,000                                                                                      
Other deferred credits 1,496,000 0                                                                                      
Other Receivables from Broker-Dealers and Clearing Organizations $ 3,200,000 $ 10,000,000                                                                                      
[1] The fair values of Asset Derivatives and Liability Derivatives exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the Consolidated Balance Sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 10, Fair Value Measurements, for information on the valuation of derivative instruments.
[2]