Segment reporting (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2025 USD ($) segment	Jul. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)
Segment reporting
Number of reportable segment | segment	1
Revenues	$ 1,938,337	$ 1,837,116	$ 2,026,465
Operating expense - equipment lease expense	18,720	21,585	23,252
Depreciation and amortization expense	98,426	98,471	93,370
Interest expense	(108,064)	(98,223)	(97,712)
Income tax expense	(1,372)	(686)	(981)
Net (loss) earnings	(16,373)	110,677	137,621
Net (loss) earnings attributable to Ferrellgas Partners, L.P.	$ (15,566)	110,216	136,881
Other segment description	Other segment items include “Non-cash employee stock ownership plan compensation charge,” “Loss on asset sales and disposals” and “Other income, net.”
Ferrellgas, L.P.
Segment reporting
Revenues	$ 1,938,337	1,837,116	2,026,465
Operating expense - equipment lease expense	18,720	21,585	23,252
Depreciation and amortization expense	98,426	98,471	93,370
Interest expense	(108,064)	(98,223)	(97,712)
Income tax expense	(1,318)	(634)	(976)
Net (loss) earnings	(15,841)	110,418	137,578
Net (loss) earnings attributable to Ferrellgas Partners, L.P.	(15,841)	110,418	137,578
Propane operation and related equipment sales segment
Segment reporting
Revenues	1,938,337	1,837,116	2,026,465
Cost of sales	915,521	853,971	1,019,270
Personnel	353,494	344,941	331,858
Vehicle	108,572	110,305	104,786
Plant and other	168,768	146,356	140,876
Operating expense - equipment lease expense	18,720	21,585	23,252
Other segment items	3,156	1,562	6,001
Litigation settlement	125,000
General and administrative expense	53,617	50,339	70,738
Depreciation and amortization expense	98,426	98,471	93,370
Interest expense	108,064	98,223	97,712
Income tax expense	1,372	686	981
Net (loss) earnings	(16,373)	110,677	137,621
Propane operation and related equipment sales segment | Ferrellgas, L.P.
Segment reporting
Revenues	1,938,337	1,837,116	2,026,465
Cost of sales	915,521	853,971	1,019,270
Personnel	353,494	344,941	331,858
Vehicle	108,572	110,305	104,786
Plant and other	168,768	146,356	140,876
Operating expense - equipment lease expense	18,720	21,585	23,252
Other segment items	3,171	1,885	6,138
Litigation settlement	125,000
General and administrative expense	53,124	50,327	70,649
Depreciation and amortization expense	98,426	98,471	93,370
Interest expense	108,064	98,223	97,712
Income tax expense	1,318	634	976
Net (loss) earnings attributable to Ferrellgas Partners, L.P.	$ (15,841)	$ 110,418	$ 137,578
Other segment description	Other segment items include “Non-cash employee stock ownership plan compensation charge,” “Loss on asset sales and disposals” and “Other income, net.”