Contingencies And Commitments (Details) $ in Thousands		1 Months Ended
	Feb. 02, 2017 item	Aug. 31, 2019 USD ($) item	Jul. 31, 2020 USD ($) item
Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Settlement paid | $		$ 6,250
Number of claims dismissed | item		11
Number of cases | item		24	13
Lawsuit Related To Sale Of Jamex Transfer Services [Member]
Loss Contingencies [Line Items]
Number of former officers | item	2
Ferrellgas Partners Finance Corp. [Member]
Loss Contingencies [Line Items]
Liability as co-issuer | $			$ 357,000
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Loss Contingencies [Line Items]
Liability as co-issuer | $			500,000
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Loss Contingencies [Line Items]
Liability as co-issuer | $			500,000
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Loss Contingencies [Line Items]
Liability as co-issuer | $			$ 475,000
Ferrellgas, L.P. [Member] | Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Settlement paid | $		$ 6,250
Number of claims dismissed | item		11
Number of cases | item		24	13
Ferrellgas, L.P. [Member] | Lawsuit Related To Sale Of Jamex Transfer Services [Member]
Loss Contingencies [Line Items]
Number of former officers | item	2