Partners' Deficit - Paid Distributions (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Limited Partners' Capital Account [Line Items]
Distributions paid		$ 157,000	$ 1,000
Common Unitholders [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid	$ 0
Ferrellgas, L.P. [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid		15,553,000	101,000
Ferrellgas, L.P. [Member] | Ferrellgas Inc., General Partner [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid		157,000		$ 158,000
Ferrellgas, L.P. [Member] | Ferrellgas Partners LP [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid		15,396,000		$ 15,496,000
Ferrellgas, L.P. [Member] | Common Unitholders [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid		15,396,000	100,000
Ferrellgas, L.P. [Member] | General Partner [Member]
Limited Partners' Capital Account [Line Items]
Distributions paid		$ 157,000	$ 1,000