Goodwill And Intangible Assets, Net (Goodwill And Intangible Assets, Net) (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Goodwill, gross carrying amount	$ 256,103	$ 256,103
Goodwill, net	256,103	256,103	$ 478,747
Amortizable intangible assets, gross carrying amount	623,079	620,043
Amortizable intangible assets, accumulated amortization	(436,428)	(404,271)
Amortizable intangible assets, net	186,651	215,772
Intangible assets gross excluding goodwill	687,530	684,456
Intangible assets amortization and impairment net excluding goodwill	(436,428)	(404,271)
Intangible assets net excluding goodwill	251,102	280,185
Ferrellgas, L.P. [Member]
Goodwill, gross carrying amount	256,103	256,103
Goodwill, net	256,103	256,103	$ 478,747
Amortizable intangible assets, gross carrying amount	623,079	620,043
Amortizable intangible assets, accumulated amortization	(436,428)	(404,271)
Amortizable intangible assets, net	186,651	215,772
Intangible assets gross excluding goodwill	687,530	684,456
Intangible assets amortization and impairment net excluding goodwill	(436,428)	(404,271)
Intangible assets net excluding goodwill	251,102	280,185
Trade Names And Trademarks [Member]
Indefinite-lived intangible assets (excluding goodwill)	64,451	64,413
Trade Names And Trademarks [Member] | Ferrellgas, L.P. [Member]
Indefinite-lived intangible assets (excluding goodwill)	64,451	64,413
Customer Lists [Member]
Amortizable intangible assets, gross carrying amount	556,678	554,030
Amortizable intangible assets, accumulated amortization	(397,891)	(372,342)
Amortizable intangible assets, net	158,787	181,688
Customer Lists [Member] | Ferrellgas, L.P. [Member]
Amortizable intangible assets, gross carrying amount	556,678	554,030
Amortizable intangible assets, accumulated amortization	(397,891)	(372,342)
Amortizable intangible assets, net	158,787	181,688
Non-Compete Agreements [Member]
Amortizable intangible assets, gross carrying amount	39,875	39,487
Amortizable intangible assets, accumulated amortization	(27,887)	(23,384)
Amortizable intangible assets, net	11,988	16,103
Non-Compete Agreements [Member] | Ferrellgas, L.P. [Member]
Amortizable intangible assets, gross carrying amount	39,875	39,487
Amortizable intangible assets, accumulated amortization	(27,887)	(23,384)
Amortizable intangible assets, net	11,988	16,103
Permits and favorable lease arrangements [Member]
Amortizable intangible assets, gross carrying amount	17,225	17,225
Amortizable intangible assets, accumulated amortization	(3,506)	(2,335)
Amortizable intangible assets, net	13,719	14,890
Permits and favorable lease arrangements [Member] | Ferrellgas, L.P. [Member]
Amortizable intangible assets, gross carrying amount	17,225	17,225
Amortizable intangible assets, accumulated amortization	(3,506)	(2,335)
Amortizable intangible assets, net	13,719	14,890
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	9,301	9,301
Amortizable intangible assets, accumulated amortization	(7,144)	(6,210)
Amortizable intangible assets, net	2,157	3,091
Other Intangible Assets [Member] | Ferrellgas, L.P. [Member]
Amortizable intangible assets, gross carrying amount	9,301	9,301
Amortizable intangible assets, accumulated amortization	(7,144)	(6,210)
Amortizable intangible assets, net	$ 2,157	$ 3,091