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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Awards in Common Units and Cash (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
AmeriGas Performance Unit awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of Common Units subject to original awards granted (in shares) | 65,525 | 53,800 | 44,800
Performance period beginning January 1: | 2015 | 2014 | 2013
Payment of awards: |  |  |
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares) | 13,164 | 29,489 | 23,017
Cash paid | $ 1.2 | $ 2.9 | $ 1.7
AmeriGas Stock Unit awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of Common Units subject to original awards granted (in shares) | 14,811 | 32,658 | 20,336
Payment of awards: |  |  |
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares) | 5,322 | 3,932 | 9,272
Cash paid | $ 0.1 | $ 0.1 | $ 0.4

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