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Partners' Deficit - Contributions and AOCI (Details) $ in Thousands, gal in Millions	3 Months Ended				6 Months Ended
	Jan. 31, 2020 USD ($) shares gal	Oct. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jan. 31, 2020 USD ($) shares gal	Jan. 31, 2019 USD ($)	Jul. 31, 2019 shares
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	97,152,665				97,152,665		97,152,665
Net procurement of fixed priced propane by Ferrellgas in gallons \| gal	4.4				4.4
Contributions in connection with non-cash ESOP compensation charges	$ 630	$ 795	$ 1,944	$ 2,748
Ferrellgas, L.P. [Member]
Capital Unit [Line Items]
Net procurement of fixed priced propane by Ferrellgas in gallons \| gal	4.4				4.4
Contributions in connection with non-cash ESOP compensation charges	$ 630	795	1,944	2,748
Ferrellgas Inc., General Partner [Member] \| Ferrellgas, L.P. [Member]
Capital Unit [Line Items]
Limited partner ownership interest					1.0101%
General partner ownership interest					1.0101%	1.0101%
Ferrellgas Inc., General Partner [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
General partner ownership interest					1.00%
Ferrell Companies [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Limited partner ownership interest					23.00%
Ferrell Companies [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	22,529,361				22,529,361		22,529,361
Ferrell Companies [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Limited partner ownership interest					23.40%
Ferrell Companies [Member] \| FCI Trading Corp. [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	195,686				195,686
Ferrell Companies [Member] \| Ferrell Propane, Inc. [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	51,204				51,204
James E. Ferrell [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	4,763,475				4,763,475		4,763,475
James E. Ferrell [Member] \| JEF Capital Management [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	4,758,859				4,758,859
James E. Ferrell [Member] \| Ferrell Resources Holdings, Inc. [Member] \| Ferrellgas Partners LP [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding \| shares	4,616				4,616
Common Unitholders [Member]
Capital Unit [Line Items]
Contributions in connection with non-cash ESOP compensation charges	$ 618	779	1,906	2,693
Common Unitholders [Member] \| Ferrellgas, L.P. [Member]
Capital Unit [Line Items]
Contributions in connection with non-cash ESOP compensation charges	624	787	1,925	2,720
General Partner [Member]
Capital Unit [Line Items]
Non-cash contribution					$ 28	$ 100
Contributions in connection with non-cash ESOP compensation charges	6	8	19	27
General Partner [Member] \| Ferrellgas, L.P. [Member]
Capital Unit [Line Items]
Non-cash contribution					$ 14	$ 100
Contributions in connection with non-cash ESOP compensation charges	$ 6	$ 8	$ 19	$ 28