Goodwill And Intangible Assets, Net - Components (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill, gross carrying amount	$ 247,195	$ 246,098
Goodwill, net	247,195	246,098
Amortizable intangible assets, gross carrying amount	471,747	469,559
Amortizable intangible assets, accumulated amortization	(414,210)	(399,629)
Amortizable intangible assets, net	57,537	69,930
Intangible assets gross excluding goodwill	522,767	520,580
Intangible assets amortization and impairment net excluding goodwill	(414,210)	(399,629)
Intangible assets net excluding goodwill	108,557	120,951
Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill, gross carrying amount	247,195	246,098
Goodwill, net	247,195	246,098
Amortizable intangible assets, gross carrying amount	471,747	469,559
Amortizable intangible assets, accumulated amortization	(414,210)	(399,629)
Amortizable intangible assets, net	57,537	69,930
Intangible assets gross excluding goodwill	522,767	520,580
Intangible assets amortization and impairment net excluding goodwill	(414,210)	(399,629)
Intangible assets net excluding goodwill	108,557	120,951
Trade Names And Trademarks [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	51,020	51,021
Trade Names And Trademarks [Member] | Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	51,020	51,021
Customer Lists [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	442,652	441,393
Amortizable intangible assets, accumulated amortization	(390,052)	(376,605)
Amortizable intangible assets, net	52,600	64,788
Customer Lists [Member] | Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	442,652	441,393
Amortizable intangible assets, accumulated amortization	(390,052)	(376,605)
Amortizable intangible assets, net	52,600	64,788
Non-Compete Agreements [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	25,582	24,653
Amortizable intangible assets, accumulated amortization	(20,645)	(19,511)
Amortizable intangible assets, net	4,937	5,142
Non-Compete Agreements [Member] | Ferrellgas, L.P. [Member]
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortizable intangible assets, gross carrying amount	25,582	24,653
Amortizable intangible assets, accumulated amortization	(20,645)	(19,511)
Amortizable intangible assets, net	4,937	5,142
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
Other Intangible Assets [Member] | Ferrellgas, L.P. [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