Goodwill And Intangible Assets, Net - Components (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill, gross carrying amount	$ 247,195	$ 247,195
Goodwill, net	247,195	247,195
Amortizable intangible assets, gross carrying amount	476,318	471,747
Amortizable intangible assets, accumulated amortization	(423,290)	(414,210)
Amortizable intangible assets, net	53,028	57,537
Intangible assets gross excluding goodwill	527,339	522,767
Intangible assets amortization and impairment net excluding goodwill	(423,290)	(414,210)
Intangible assets net excluding goodwill	104,049	108,557
Trade Names And Trademarks [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	51,021	51,020
Customer Lists [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	446,486	442,652
Amortizable intangible assets, accumulated amortization	(397,843)	(390,052)
Amortizable intangible assets, net	48,643	52,600
Non-Compete Agreements [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	26,319	25,582
Amortizable intangible assets, accumulated amortization	(21,934)	(20,645)
Amortizable intangible assets, net	4,385	4,937
Other Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	3,513	3,513
Amortizable intangible assets, accumulated amortization	(3,513)	(3,513)
Amortizable intangible assets, net	0	0
Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill, gross carrying amount	247,195	247,195
Goodwill, net	247,195	247,195
Amortizable intangible assets, gross carrying amount	476,318	471,747
Amortizable intangible assets, accumulated amortization	(423,290)	(414,210)
Amortizable intangible assets, net	53,028	57,537
Intangible assets gross excluding goodwill	527,339	522,767
Intangible assets amortization and impairment net excluding goodwill	(423,290)	(414,210)
Intangible assets net excluding goodwill	104,049	108,557
Ferrellgas, L.P. [Member] | Trade Names And Trademarks [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	51,021	51,020
Ferrellgas, L.P. [Member] | Customer Lists [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	446,486	442,652
Amortizable intangible assets, accumulated amortization	(397,843)	(390,052)
Amortizable intangible assets, net	48,643	52,600
Ferrellgas, L.P. [Member] | Non-Compete Agreements [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	26,319	25,582
Amortizable intangible assets, accumulated amortization	(21,934)	(20,645)
Amortizable intangible assets, net	4,385	4,937
Ferrellgas, L.P. [Member] | Other Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	3,513	3,513
Amortizable intangible assets, accumulated amortization	(3,513)	(3,513)
Amortizable intangible assets, net	$ 0	$ 0