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