Goodwill And Intangible Assets, Net - Lives (Details)	12 Months Ended
	Jul. 31, 2020
Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	2 years
Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	15 years
Customer Lists [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset, weighted average useful life	15 years
Customer Lists [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	15 years
Non Compete Agreements And Other Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset, weighted average useful life	10 years
Non Compete Agreements And Other Intangible Assets [Member] | Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	5 years
Non Compete Agreements And Other Intangible Assets [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	10 years
Ferrellgas, L.P. [Member] | Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	2 years
Ferrellgas, L.P. [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	15 years
Ferrellgas, L.P. [Member] | Customer Lists [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	15 years
Intangible asset, weighted average useful life	15 years
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset, weighted average useful life	10 years
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member] | Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	5 years
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset useful life	10 years