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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Off System Sales (Details) | Sep. 30, 2014
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Laclede Gas | First $2 million |
Off System Sales [Line Items] |
Customer Share | 100.00%
Company Share | 0.00%
Laclede Gas | Next $2 million |
Off System Sales [Line Items] |
Customer Share | 80.00%
Company Share | 20.00%
Laclede Gas | Next $2 million |
Off System Sales [Line Items] |
Customer Share | 75.00%
Company Share | 25.00%
Laclede Gas | Amounts exceeding $6 million |
Off System Sales [Line Items] |
Customer Share | 70.00%
Company Share | 30.00%
Missouri Gas Energy (MGE) | First $1.2 million |
Off System Sales [Line Items] |
Customer Share | 85.00%
Company Share | 15.00%
Missouri Gas Energy (MGE) | Next $1.2 million |
Off System Sales [Line Items] |
Customer Share | 80.00%
Company Share | 20.00%
Missouri Gas Energy (MGE) | Next $1.2 million |
Off System Sales [Line Items] |
Customer Share | 75.00%
Company Share | 25.00%
Missouri Gas Energy (MGE) | Amounts exceeding $3.6 million |
Off System Sales [Line Items] |
Customer Share | 70.00%
Company Share | 30.00%

X
- Definition The revenue of off system sales attributable to the entity. + References No definition available. + Details
Name: | lg_CompanyShare
Namespace Prefix: | lg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The revenue of off system sales attributable to customers. + References No definition available. + Details
Name: | lg_CustomerShare
Namespace Prefix: | lg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | lg_OffSystemSalesLineItems
Namespace Prefix: | lg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration