Contingencies And Commitments (Details) shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2022 USD ($) item	Mar. 30, 2021 shares	Jul. 31, 2020 USD ($)
Class B Limited Partner Units
Loss Contingencies [Line Items]
Units issued | shares		1.3
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			$ 357.0
Ferrellgas Partners Finance Corp. [Member] | Class B Limited Partner Units
Loss Contingencies [Line Items]
Units issued | shares		1.3
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Loss Contingencies [Line Items]
Liability as co-issuer			500.0
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Loss Contingencies [Line Items]
Liability as co-issuer			500.0
Ferrellgas Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Loss Contingencies [Line Items]
Liability as co-issuer			475.0
Ferrellgas Finance Corp. [Member] | Fixed rate 10.00% Due 2025
Loss Contingencies [Line Items]
Liability as co-issuer			$ 700.0
Ferrellgas Finance Corp. [Member] | Senior Notes 5.375 Percent Due 2026 [Member]
Loss Contingencies [Line Items]
Liability as co-issuer	$ 650.0
Ferrellgas Finance Corp. [Member] | Senior Notes 5.875 Percent Due 2029 [Member]
Loss Contingencies [Line Items]
Liability as co-issuer	$ 825.0