Contingencies And Commitments (Details)	1 Months Ended	6 Months Ended
	Aug. 31, 2019 USD ($) item	Jan. 31, 2021 USD ($) item
Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Settlement paid | $	$ 6,250,000
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] | Fixed rate, 8.625%, due 2020
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		$ 357,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed rate, 6.5%, due 2021
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed rate, 6.75%, due 2023
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed rate, 6.75%, due 2022
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		$ 475,000,000
Ferrellgas, L.P. [Member] | Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Settlement paid | $	$ 6,250,000
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