Significant Transactions (Details) $ / shares in Units, shares in Millions	3 Months Ended							12 Months Ended
	Jul. 31, 2017 USD ($) $ / shares	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($) shares	Jul. 31, 2016 MMBbls	Jan. 31, 2016 USD ($) shares	Oct. 31, 2015 MMBbls	Jul. 31, 2017 USD ($) $ / shares shares	Jul. 31, 2016 USD ($) $ / shares MMBbls	Jul. 31, 2015 USD ($)
Payments for Repurchase of Common Stock								$ (15,851,000)	$ (46,432,000)	$ 0
Partners' Capital Account, Units, Treasury Units Purchased | shares				0.9		2.4
Energy Related Inventory, Crude Oil and Natural Gas Liquids				$ 23,000
Proceeds from Interest Received			$ 900,000
Proceeds from Collection of Notes Receivable	$ 2,800,000
Concentration Risk, Customer					0.6
Long-term Purchase Commitment, Minimum Volume Required | MMBbls					65
Oil and Gas Delivery Commitments and Oil and Gas Delivery Commitments and Contracts, Available Amounts to be Received | MMBbls					35				35
Distribution Made to Limited Partner, Distributions Declared, Per Unit | $ / shares	$ 0.10							$ 0.40	$ 2.05
Jamex Marketing, LLC [Member]
Loans and Leases Receivable, Related Parties, Proceeds								$ 49,500,000
Notes Receivable, Related Parties	$ 42,500,000							42,500,000
Increase (Decrease) in Notes Receivable, Related Parties, Current								5,000,000
Payments for Repurchase of Common Stock						$ 45,900,000		$ 16,900,000
Partners' Capital Account, Units, Treasury Units Purchased | shares								0.9
Related Party Transaction, Rate	2.80%			7.00%
Loans and Leases Receivable, Commitments, Fixed Rates								$ 0.0
Loans and Leases Receivable, Description								10
Notes Receivable, Related Parties	$ 20,000,000							$ 20,000,000
Ferrellgas, L.P. [Member]
Partners' Capital Account, Units, Treasury Units Purchased | shares				0.9		2.4
Energy Related Inventory, Crude Oil and Natural Gas Liquids				$ 23,000
Proceeds from Interest Received			$ 900,000
Proceeds from Collection of Notes Receivable		$ 2,800,000
Concentration Risk, Customer									0.6
Long-term Purchase Commitment, Minimum Volume Required | MMBbls							65
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] | Jamex Marketing, LLC [Member]
Loans and Leases Receivable, Related Parties, Proceeds						$ 49,500,000
Notes Receivable, Related Parties	$ 20,000,000	$ 42,500,000						20,000,000
Increase (Decrease) in Notes Receivable, Related Parties, Current				5,000,000
Payments for Repurchase of Common Stock				$ 16,900,000		$ 45,900,000
Related Party Transaction, Rate		2.80%		7.00%
Loans and Leases Receivable, Commitments, Fixed Rates								$ 0.0
Loans and Leases Receivable, Description				10