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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Assets    
Non-utility property (net of accumulated depreciation and amortization) $ 7.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 6.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Capitalization:    
Common stock, par value (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized (in shares) 70,000,000us-gaap_CommonStockSharesAuthorized 70,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued (in shares) 43,300,000us-gaap_CommonStockSharesIssued 43,200,000us-gaap_CommonStockSharesIssued
Common stock, outstanding (in shares) 43,300,000us-gaap_CommonStockSharesOutstanding 43,200,000us-gaap_CommonStockSharesOutstanding
Laclede Gas    
Capitalization:    
Common stock, par value (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
$ 1.00us-gaap_CommonStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Common stock, authorized (in shares) 50,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
50,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Common stock, issued (in shares) 24,577us-gaap_CommonStockSharesIssued
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
24,577us-gaap_CommonStockSharesIssued
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Common stock, outstanding (in shares) 24,577us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
24,577us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Alagasco    
Capitalization:    
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Common stock, authorized (in shares) 3,000,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
3,000,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Common stock, issued (in shares) 2,000,000us-gaap_CommonStockSharesIssued
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
2,000,000us-gaap_CommonStockSharesIssued
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Common stock, outstanding (in shares) 2,000,000us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
2,000,000us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember