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Common Stock and Equity Based Compensation (Details 3)	12 Months Ended
Common Stock and Equity Based Compensation (Details 3)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected life	5 years 9 months	5 years 9 months	5 years 9 months
UGI Performance Units [Member]
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Risk-free rate	0.40%	1.00%	1.70%
Expected life	3 years	3 years	3 years
Expected volatility	22.20%	27.60%	28.00%
Dividend Yield	3.50%	3.20%	3.30%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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