Asset Impairments (Details)	3 Months Ended			12 Months Ended
	Jul. 31, 2016 USD ($) MMBbls	Oct. 31, 2015 USD ($) MMBbls	Jul. 31, 2015 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($) MMBbls	Jul. 31, 2015 USD ($)
WTI average closing price		$ 44.90	$ 56.63
WTI quarterly price decrease		20.70%
WTi crude curve decrease		6.50%
Goodwill, Impairment Loss					$ (219,870,000)
Concentration Risk, Customer	0.6
Long-term Purchase Commitment, Minimum Volume Required | MMBbls	65
Asset Impairment Charges	$ 628,800,000			$ 0	658,118,000	$ 0
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 0				$ 0
Fair Value Inputs, Discount Rate					11.50%
Oil and Gas Delivery Commitments and Oil and Gas Delivery Commitments and Contracts, Available Amounts to be Received | MMBbls	35				35
Non Compete Agreements And Other Intangible Assets [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					$ 249,000,000
Trade Names And Trademarks [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					7,400,000
Midstream Operations - Water Solutions [Member]
Goodwill, Impairment Loss		$ (29,316,000)
Midstream - Crude Oil Logistics [Member]
Goodwill, Impairment Loss					(190,554,000)
Midstream Operations - Water Solutions [Member]
Goodwill, Impairment Loss				29,300,000
Ferrellgas, L.P. [Member]
WTI average closing price		$ 44.90	$ 56.63
WTI quarterly price decrease		20.70%
WTi crude curve decrease		6.50%
Goodwill, Impairment Loss					$ (219,870,000)
Concentration Risk, Customer					0.6
Long-term Purchase Commitment, Minimum Volume Required | MMBbls		65
Asset Impairment Charges	$ 628,800,000			$ 0	$ 658,118,000	$ 0
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 0				$ 0
Fair Value Inputs, Discount Rate					11.50%
Oil and Gas Delivery Commitments and Oil and Gas Delivery Commitments and Contracts, Available Amounts to be Received | MMBbls	35				35
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					$ 249,000,000
Ferrellgas, L.P. [Member] | Trade Names And Trademarks [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					7,400,000
Ferrellgas, L.P. [Member] | Midstream Operations - Water Solutions [Member]
Goodwill, Impairment Loss		$ (29,316,000)			(29,316,000)
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Goodwill, Impairment Loss					(190,600,000)
Property And Equipment [Member]
Asset Impairment Charges					181,800,000
Property And Equipment [Member] | Ferrellgas, L.P. [Member]
Asset Impairment Charges					$ 181,800,000