Transactions With Related Parties (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2019 USD ($) employee	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Entity Number of Employees | employee	0
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
Operating Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 256,190	$ 243,407	$ 228,969
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	256,190	243,407	228,969
General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	25,368	28,282	31,068
General and Administrative Expense [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Expenses reimbursed to related party | $	$ 25,368	$ 28,282	$ 31,068