Goodwill And Intangible Assets, Net - Aggregate Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Aggregate amortization expense	$ 9,079	$ 14,581	$ 31,345
Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Aggregate amortization expense	$ 9,079	$ 14,581	$ 31,345