Debt (Details) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended		1 Months Ended		9 Months Ended			9 Months Ended				9 Months Ended		1 Months Ended	9 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] USD ($)	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Letter of Credit [Member] USD ($)	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Maximum [Member]	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Minimum [Member]	Jun. 30, 2011 Existing Revolving Credit Agreement [Member] USD ($)	Jun. 30, 2011 Supplemented Credit Agreement Member] USD ($)	Jun. 30, 2011 Antargaz 2011 Senior Facilities [Member] EUR (€)	Jun. 30, 2011 Antargaz 2011 Senior Facilities [Member] Variable-rate Term Loan [Member] EUR (€)	Jun. 30, 2011 Antargaz 2011 Senior Facilities [Member] Revolving Credit Facility [Member] EUR (€)	Jun. 30, 2011 Antargaz 2011 Senior Facilities [Member] Maximum [Member]	Jun. 30, 2011 Antargaz 2011 Senior Facilities [Member] Minimum [Member]	Jun. 30, 2011 UGI Utilities 2011 Credit Agreement [Member]	May 25, 2011 UGI Utilities 2011 Credit Agreement [Member] USD ($)	Jun. 30, 2011 UGI Utilities 2011 Credit Agreement [Member] Maximum [Member]	Jun. 30, 2011 UGI Utilities 2011 Credit Agreement [Member] Minimum [Member]	May 31, 2011 UGI Utilities existing revolving credit agreement [Member] USD ($)	Jun. 30, 2011 Flaga multi-currency working capital facility [Member] EUR (€)	Jun. 30, 2011 Flaga euro-denominated working capital facility [Member] EUR (€)	Jun. 30, 2011 6.50% Senior Notes due 2021 [Member] USD ($)	Jun. 30, 2011 8.875% Senior Notes due May 2011 [Member] USD ($)	Jun. 30, 2011 7.25% Senior Notes [Member] USD ($)	Jun. 30, 2011 AmeriGas Propane [Member] USD ($)
Debt (Textuals) [Abstract]
Proceeds from issuance of senior notes									€ 380											$ 470
Repayment of Senior Notes																					14.6	415.0
Interest rate on notes																				6.50%	8.875%	7.25%
Loss on extinguishment of debt	18.8																						18.8
Borrowing capacity under revolving credit agreement		325								40				300				24	12
Debt compliance ratio								3.50					0.65
Revolving credit agreement sublimit for letters of credit			100											100
Borrowing capacity of credit agreement terminated						200	75										350
Interest rate for credit agreement		base rate plus a margin or at a two-week, one-, two-, three-, or six-month Eurodollar Rate						one-, two-, three- or six-month euribor, plus a margin.					LIBOR and the banks’ prime rate, plus a margin
Base rate for revolving credit agreement		higher of the Federal Funds rate plus 0.50% or the agent bank’s prime rate
Margin on credit agreement base rate borrowings				1.75%	0.75%						2.50%	1.75%			2.00%	0.00%
Margin on credit agreement Eurodollar rate borrowings				2.75%	1.75%
Credit agreement facility fee rate				0.50%	0.30%
Maturities under term loan, May 2014									38
Maturities under term loan, May 2015									34.2
Maturities under term loan, March 2016									307.8
Effective underlying euribor rate of interest on term loan through September 2015									2.45%
Effective underlying euribor rate of interest on term loan after September 2015									3.71%
Effective interest rate on term loan									4.66%
Payments guaranteed by UGI								100
Date of expiration extension																		September 2011	March 2012
Reduction in net income attributable to UGI Corporation due to extinguishment loss	$ 5.2