Transactions With Related Parties (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2020 USD ($) employee	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0
Operating Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 260,427	$ 256,190	$ 243,407
General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 29,859	25,368	28,282
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0
Ferrellgas, L.P. [Member] | Operating Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 260,427	256,190	243,407
Ferrellgas, L.P. [Member] | General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 29,859	$ 25,368	$ 28,282
Ferrellgas Finance Corp. [Member]
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0
Ferrellgas Partners Finance Corp. [Member]
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0