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v3.19.1

Nature of Operations (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) county | Mar. 31, 2018 USD ($)
Investment [Line Items] |  |  |  |
General Partner incentive distribution | $ |  |  | $ 22.9 | $ 22.7
Number of counties of operation | county |  |  | 1 |
AmeriGas Propane | AmeriGas Partners |  |  |  |
Investment [Line Items] |  |  |  |
General Partner held a general partner interest in AmeriGas Partners (percentage) | 1.00% |  | 1.00% |
Percentage of limited partnership interest in AmeriGas Partners (percentage) | 25.30% |  |  |
General public as limited partner interests in AmeriGas Partners (percentage) | 73.70% |  | 73.70% |
AmeriGas Propane | AmeriGas OLP |  |  |  |
Investment [Line Items] |  |  |  |
Effective ownership interest in AmeriGas OLP (percentage) | 27.00% |  | 27.00% |
Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Proposed consideration | $ |  | $ 530.0 |  |
Common Stock | Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Proposed consideration issuable (in shares) |  | 34,600,000 |  |
Units issuable (in units) |  | 10,615,711 |  |
Proposed Consideration One | Common Stock | Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Number of shares issuable per acquiree stock (in shares) |  | 0.6378 |  |
Proposed Consideration Two | Common Stock | Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Number of shares issuable per acquiree stock (in shares) |  | 0.500 |  |
Proposed Consideration Two | Cash Without Interest | Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Cash issuable per acquiree stock | $ / shares |  | $ 7.63 |  |
Proposed Consideration Three | Cash Without Interest | Subsequent Event | Merger Sub | Forecast |  |  |  |
Investment [Line Items] |  |  |  |
Cash issuable per acquiree stock | $ / shares |  | $ 35.325 |  |

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