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Nature of Operations (Details) $ in Millions				12 Months Ended
	Aug. 21, 2019 USD ($) shares	Aug. 20, 2019	Aug. 01, 2019 shares	Sep. 30, 2019 USD ($) county shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Investment [Line Items]
Total cash paid				$ 528.9	$ 0.0	$ 0.0
General Partner held a general partner interest in AmeriGas Partners				2.00%
Percentage of limited partnership interest in AmeriGas Partners				98.00%
Number of counties of operation | county				1
AmeriGas Partners
Investment [Line Items]
General Partner held a general partner interest in AmeriGas Partners				1.00%
AmeriGas OLP
Investment [Line Items]
General Partner held a general partner interest in AmeriGas Partners				1.01%
AmeriGas Propane | AmeriGas Partners
Investment [Line Items]
General Partner held a general partner interest in AmeriGas Partners		1.00%
Percentage of limited partnership interest in AmeriGas Partners		25.50%
AmeriGas Propane | AmeriGas OLP
Investment [Line Items]
Effective ownership interest in AmeriGas OLP		27.00%
Merger Sub
Investment [Line Items]
Total cash paid	$ 528.9
Merger Sub | Common Stock
Investment [Line Items]
Consideration paid (in shares) | shares	34,612,847		34,612,847	34,613,000
Pennant | Affiliated Entity | CMG
Investment [Line Items]
Ownership percentage			47.00%

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