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Employee Retirement Plans (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure      
Amortization of net actuarial losses $ 17,000,000    
Amortization of prior service credits $ 500,000    
Percentage point change in assumed health care cost trend rate 1.00%    
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans $ 47,400,000 $ 40,100,000  
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans 2,600,000 2,300,000 $ 2,600,000
Amounts recorded in UGI's stockholders include pre-tax losses representing unrecognized actuarial losses (13,000,000) $ (10,100,000)  
Amount of expected amortization of pre-tax actuarial losses into retiree benefit cost $ 1,200,000    
Percentage of aggregate employer securities holdings to not to exceed fair value assets 10.00%    
Percentage of common stock represented pension plan assets 8.00% 10.10%  
Costs of benefits under savings plans $ 14,300,000 $ 15,200,000 14,700,000
Supplemental Defined Contribution Executive Retirement Plans      
Defined Benefit Plan Disclosure      
Total fair values of grantor trust investment assets 4,600,000 4,200,000  
U.S Pension Plans      
Defined Benefit Plan Disclosure      
ABO for the Pension Plans 601,300,000 523,700,000  
Contribution made to Pension Plan 9,900,000 11,100,000 19,200,000
Fair value of Pension and Other Postretirement Benefit contributions 463,400,000 430,800,000  
Supplemental Employee Retirement Plans      
Defined Benefit Plan Disclosure      
Pension and Other Postretirement Benefit contributions 400,000 0 $ 300,000
Supplemental Employee Retirement Plans | Other Assets      
Defined Benefit Plan Disclosure      
Fair value of Pension and Other Postretirement Benefit contributions $ 28,400,000 $ 26,100,000