Consolidated Balance Sheets (Parenthetical) - USD ($)	Jul. 31, 2017	Jul. 31, 2016
Accounts receivable pledged as collateral	$ 109,407,000	$ 106,464,000
Allowance for doubtful accounts	$ 1,976,000	$ 5,067,000
Common unitholders, units outstanding	97,152,665	98,002,665
General partner unitholder, units outstanding	989,926	989,926
Ferrellgas Partners Finance Corp. [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	2,000	2,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000
Ferrellgas, L.P. [Member]
Accounts receivable pledged as collateral	$ 109,407,000	$ 106,464,000
Allowance for doubtful accounts	$ 1,967,000	$ 5,067,000
Ferrellgas Finance Corp. [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	2,000	2,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000