Goodwill And Intangible Assets, Net (Narrative) (Details)	12 Months Ended
	Jul. 31, 2017
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	15 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	13 years
Customer Lists [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Customer Lists [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	15 years
Permits and favorable lease arrangements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	13 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	7 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	7 years
Non Compete Agreements And Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	2 years
Non Compete Agreements And Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Ferrellgas, L.P. [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	2 years
Ferrellgas, L.P. [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	15 years
Ferrellgas, L.P. [Member] | Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	15 years
Intangible asset, weighted average useful life	13 years
Ferrellgas, L.P. [Member] | Customer Lists [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Ferrellgas, L.P. [Member] | Customer Lists [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	15 years
Ferrellgas, L.P. [Member] | Permits and favorable lease arrangements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	13 years
Ferrellgas, L.P. [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	7 years
Ferrellgas, L.P. [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, weighted average useful life	7 years
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	2 years
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years