Schedule I Parent Only Statements - Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Condensed Income Statements, Captions [Line Items]
Operating, general and administrative expense	$ 52,780	$ 60,065	$ 45,752
Operating income	245,101	216,275	148,670
Interest expense	(100,093)	(173,616)	(192,962)
Gain (loss) on extinguishment of debt	0	(104,834)	(37,399)
Other expense, net	4,833	4,246	(460)
Reorganization expense - professional fees		(10,443)
Income tax (benefit) expense	981	741	851
Net earnings (loss)	148,860	(69,113)	(83,002)
Net earnings (loss) attributable to Ferrellgas Partners, L.P.	147,993	(68,411)	(82,499)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Equity in earnings (loss) of Ferrellgas, L.P.	150,262	(44,740)	(49,261)
Operating, general and administrative expense	(13)	(389)	(116)
Operating income	150,249	(45,129)	(49,377)
Interest expense		(13,771)	(33,073)
Gain (loss) on extinguishment of debt		3,137
Other expense, net	(2,251)	(2,191)
Reorganization expense - professional fees		(10,443)
Income tax (benefit) expense	(5)	(14)	(49)
Net earnings (loss)	147,993	(68,411)	(82,499)
Distribution to Class B Unitholders	99,996
Net earnings (loss) attributable to Ferrellgas Partners, L.P.	$ 47,997	$ (68,411)	$ (82,499)