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Common Stock and Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |
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Aug. 21, 2019 USD ($) shares | Jan. 28, 2019 | Sep. 30, 2018 USD ($) shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Jan. 25, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Treasury stock acquired | $ |  |  | $ 19.7 | $ 15.9 | $ 19.7 |  |
Pre-tax equity-based compensation expense | $ |  |  |  | 18.1 | 22.5 | $ 19.3 |
After tax equity-based compensation expense | $ |  |  |  | 13.2 | 15.7 | 11.8 |
Cash received from stock option exercises | $ |  |  |  | 19.5 | 43.4 | 17.7 |
Associated tax benefits | $ |  |  |  | 5.1 | $ 12.6 | $ 9.6 |
Unrecognized compensation cost associated with unvested unit awards | $ |  |  |  | $ 8.3 |  |  |
Weighted-average period of recognition for unvested unit awards |  |  |  | 2 years |  |  |
UGI Stock Option Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) | $ / shares |  |  |  | $ 8.70 | $ 7.51 | $ 7.62 |
UGI Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) | $ / shares |  |  |  | $ 55.40 | $ 55.26 | $ 50.91 |
Award performance period |  |  |  | 3 years |  |  |
Expected term of Performance Unit awards |  |  |  | 3 years |  |  |
Expected volatility measurement period (in years) |  |  |  | 3 years |  |  |
UGI Units awarded (in shares) |  |  |  | 128,910 | 52,314,000,000 | 42,079,000,000 |
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  |  | $ 55.40 |  |  |
UGI Performance Units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 0.00% |  |  |
UGI Performance Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 200.00% |  |  |
Cash Settled Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Pre-tax equity-based compensation expense | $ |  |  |  | $ 2.4 |  |  |
Weighted-average period of recognition for unvested unit awards |  |  |  | 1 year 3 months 18 days |  |  |
UGI Unit awards outstanding (in shares) |  |  |  | 212,896 |  |  |
Cost not yet recognized | $ |  |  |  | $ 4.6 |  |  |
UGI Performance Units and Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Unrecognized compensation cost associated with unvested unit awards | $ |  |  |  | $ 7.6 |  |  |
Weighted-average period of recognition for unvested unit awards |  |  |  | 1 year 10 months 24 days |  |  |
UGI Units awarded (in shares) |  |  |  | 158,694 | 196,114 | 185,379 |
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  |  | $ 55.40 | $ 53.36 | $ 50.08 |
UGI Unit awards outstanding (in shares) |  |  | 959,718 | 893,820 | 959,718 |  |
Fair value of unit awards vested | $ |  |  |  | $ 4.9 | $ 7.3 | $ 7.1 |
Liabilities associated with share based compensation | $ |  |  | $ 18.8 | $ 10.2 | $ 18.8 |  |
Amerigas Performance Units and Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
UGI Unit awards outstanding (in shares) |  |  | 236,762 | 0 | 236,762 |  |
Fair value of unit awards vested | $ |  |  |  | $ 0.9 | $ 2.2 | $ 2.1 |
Liabilities associated with share based compensation | $ |  |  | $ 2.3 |  | $ 2.3 |  |
Conversion ratio | 0.6378 |  |  |  |  |  |
Accrued distribution equivalent | $ | $ 1.8 |  |  |  |  |  |
AmeriGas Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Expected term of Performance Unit awards |  |  |  | 3 years |  |  |
UGI Units awarded (in shares) |  |  |  | 79,980 |  |  |
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  |  | $ 30.23 |  |  |
Units converted to UGI cash-settled restricted units (in shares) | 137,472 |  |  |  |  |  |
AmeriGas Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
UGI Units awarded (in shares) |  |  |  | 53,118 |  |  |
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  |  | $ 31.10 |  |  |
UGI Unit awards outstanding (in shares) | 263,561 |  |  |  |  |  |
Units converted to UGI cash-settled restricted units (in shares) | 126,089 |  |  | 263,561 |  |  |
Amerigas Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Vested units (in shares) |  |  | 71,148 |  |  |  |
Total Unitholder Return at 25th Percentile | UGI Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 25.00% |  |  |
Total Unitholder Return at 40th Percentile | UGI Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 70.00% |  |  |
Total Unitholder Return at 50th Percentile | UGI Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 100.00% |  |  |
Total Unitholder Return at 90th Percentile | UGI Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 200.00% |  |  |
2010 Propane Plan | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Total unitholder return ranking |  |  |  | 70.00% |  |  |
2010 Propane Plan | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Total unitholder return ranking |  |  |  | 130.00% |  |  |
2010 Propane Plan | UGI Performance Units and Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
UGI Unit awards outstanding (in shares) |  |  |  | 1,420,949 |  |  |
2010 Propane Plan | Amerigas Performance Units and Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Award performance period |  |  |  | 3 years |  |  |
2010 Propane Plan | AmeriGas Performance Units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 0.00% |  |  |
2010 Propane Plan | AmeriGas Performance Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 200.00% |  |  |
2010 Propane Plan | AmeriGas Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) | $ / shares |  |  |  | $ 30.58 | $ 50.05 | $ 52.37 |
UGI Units awarded (in shares) |  |  |  | 133,098 | 84,811 | 67,563 |
2010 Propane Plan | Total Unitholder Return at 25th Percentile | AmeriGas Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 0.00% |  |  |
2010 Propane Plan | Total Unitholder Return at 90th Percentile | AmeriGas Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of target award to be granted |  |  |  | 200.00% |  |  |
Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase (in shares) |  |  |  |  |  |  | 8,000,000,000,000
Duration of stock repurchase program |  | 4 years |  |  |  |  |
Treasury stock acquired | $ |  |  | $ 59.8 | $ 16.9 | $ 59.8 | $ 43.3 |
Common Stock | 2013 Omnibus Incentive Compensation Plan (OICP) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |
Common Stock awards granted (in shares) |  |  |  | 21,750,000 |  |  |
Number of common unit awards available for future grant (in shares) |  |  |  | 8,700,734,000,000 |  |  |
Common Stock | Treasury Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  | 300,000 | 1,200,000 | 900,000 |
AmeriGas Performance Units | Cash Settled Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Issuance in period due to conversion (in shares) | 215,957 |  |  |  |  |  |

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