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Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Significant Accounting Policies (Textual) [Abstract] |  |
Decrease in income tax expense |  | $ 5.5
Ownership interests in certain subsidiaries under equity method investment, maximum | 100.00% |

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- Definition Decrease in income tax expense (benefit). + References No definition available. + Details
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- Definition Ownership interests in certain subsidiaries under equity method investment, maximum + References No definition available. + Details
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- Details
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Namespace Prefix: | ugi_
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