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Partnership Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Distribution Made to Limited Partner |  |  |
Partnership distributions to partners (days following quarter end) | 45 days |  |
Percentage of limited partnership interest (as a percent) | 98.00% |  |
General Partner held a general partner interest (as a percent) | 2.00% |  |
First target distribution (in dollars per share) | $ 0.055 |  |
Threshold for increased distribution to General Partner (in dollars per share) | $ 0.605 |  |
Pre-Incentive distribution of available cash to General Partners | 2.00% | 2.00% | 2.00%
General Partners distribution based on ownership interest | $ 54.9 | $ 52.7 | $ 47.4
Incentive distributions received by the General Partner | $ 45.3 | $ 43.5 | $ 38.2
Minimum |  |  |
Distribution Made to Limited Partner |  |  |
Quarterly distribution (in dollars per share) | $ 0.55 |  |
Available cash for per common unit (more than) (in dollars per share) | $ 0.605 | $ 0.605 | $ 0.605
AmeriGas Partners |  |  |
Distribution Made to Limited Partner |  |  |
General Partner held a general partner interest (as a percent) | 1.00% |  |
AmeriGas OLP |  |  |
Distribution Made to Limited Partner |  |  |
General Partner held a general partner interest (as a percent) | 1.01% |  |

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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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