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Summary of Significant Accounting Policies (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 29, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Accounting Policies [Abstract] |  |  |  |
Ownership interests in certain subsidiaries under equity method investment, maximum |  | 100.00% |  |
Voting rights in investment businesses not traded publicly accounted for under the cost method, maximum |  | 20.00% |  |
Maturities Period of highly liquid investments |  | three months or less |  |
Accumulated impairment losses |  | $ 0 |  |
Provision for goodwill or other intangible asset impairments |  | 0 | 0 | 0
Provisions for impairments |  | 0 | 0 | 0
Other-than-temporary impairment of an investment in a private equity partnership pre-tax loss |  | 0 | 6,300,000 | 0
Net deferred debt issuance costs |  | 36,700,000 | 39,400,000 |
Foreign subsidiary customer deposits |  | 200,000,000 | 214,600,000 |
Average to include prudently incurred remediation costs |  | 5 years |  |
Property, Plant and Equipment |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 1.5 |  |  |
Estimated maximum period of capitalized and amortized costs to install partnership and antargaz-owned tanks |  | 10 years |  |
Estimated useful life of definite-lived intangible assets |  | 15 years |  |
Gas Utility |  |  |  |
Property, Plant and Equipment |  |  |  |
Depreciation expense as percentage of related average depreciable base |  | 2.30% | 2.30% | 2.20%
Electric Utility |  |  |  |
Property, Plant and Equipment |  |  |  |
Depreciation expense as percentage of related average depreciable base |  | 2.50% | 2.40% | 2.40%
Non-utility Plant and Equipment | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 10 years |  |
Non-utility Plant and Equipment | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 40 years |  |
Storage and Customer Tanks and Cylinders | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 6 years |  |
Storage and Customer Tanks and Cylinders | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 40 years |  |
Electricity Generation Facilities | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 25 years |  |
Electricity Generation Facilities | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 40 years |  |
Pipeline and Related Assets | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 25 years |  |
Pipeline and Related Assets | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 40 years |  |
Vehicles, Equipment and Office Furniture and Fixtures | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 3 years |  |
Vehicles, Equipment and Office Furniture and Fixtures | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 12 years |  |
Software and Software Development Costs [Member] | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Useful life (in years) |  | 10 years |  |
Other Assets |  |  |  |
Property, Plant and Equipment |  |  |  |
Cost method investments |  | 77,800,000 | 82,000,000 |
Other Assets | Private Equity Partnership That Invests in Renewable Energy Companies |  |  |  |
Property, Plant and Equipment |  |  |  |
Cost method investments |  | $ 17,400,000 | $ 16,400,000 |
Interest in a private equity partnership |  | 3.50% |  |

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