Transactions With Related Parties (Narrative) (Details) $ in Thousands, shares in Millions	3 Months Ended		12 Months Ended
	Oct. 31, 2016 USD ($) shares	Jan. 31, 2016 USD ($) shares	Jul. 31, 2017 USD ($) employee shares	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)
Limited partner ownership interest			5.00%	5.00%
Number of employees | employee			0
Partners' Capital Account, Units, Treasury Units Purchased | shares	0.9	2.4
Payments for Repurchase of Common Stock			$ (15,851)	$ (46,432)	$ 0
Ferrellgas, L.P. [Member]
Number of employees | employee			0
Partners' Capital Account, Units, Treasury Units Purchased | shares	0.9	2.4
Jamex Marketing, LLC [Member]
Revenues				62,600	9,400
Related Party Costs				3,400	8,400
Accounts Receivable, Related Parties				44,800
Accounts Payable, Related Parties				0
Partners' Capital Account, Units, Treasury Units Purchased | shares			0.9
Payments for Repurchase of Common Stock		$ 45,900	$ 16,900
Jamex Marketing, LLC [Member] | Ferrellgas, L.P. [Member]
Revenues				62,600	9,400
Related Party Costs				3,400	$ 8,400
Accounts Receivable, Related Parties				44,800
Accounts Payable, Related Parties				$ 0
Payments for Repurchase of Common Stock	$ 16,900	45,900
Credit Facility [Domain]
Payments for Repurchase of Common Stock	$ 16,900	$ 45,900
Credit Facility [Domain] | Ferrellgas, L.P. [Member]
Limited partner ownership interest			5.00%