XML 127 R88.htm IDEA: XBRL DOCUMENT v2.4.0.6
Common Stock and Equity Based Compensation (Details 2)
12 Months Ended
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 of option 5 years 9 months 5 years 9 months 5 years 9 months
Weighted average volatility 24.70% 24.30% 24.00%
Weighted average dividend yield 3.50% 3.40% 3.30%
Minimum [Member]
     
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs      
Expected volatility 24.70% 23.80% 24.00%
Expected dividend yield 3.30% 3.10% 3.30%
Risk-free rate 0.80% 1.20% 1.70%
Maximum [Member]
     
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs      
Expected volatility 24.70% 24.30% 24.00%
Expected dividend yield 3.70% 3.40% 3.40%
Risk-free rate 1.10% 2.40% 3.10%