Summary of significant accounting policies - Deferred Taxes Assets And Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jul. 31, 2024
Significant Accounting Policies [Line Items]
Deferred tax assets (included in Other assets, net)	$ 11	$ 4
Deferred tax liabilities (included in Other liabilities)	(7)	(3)
Net deferred tax asset	4	1
Ferrellgas, L.P.
Significant Accounting Policies [Line Items]
Deferred tax assets (included in Other assets, net)	11	4
Deferred tax liabilities (included in Other liabilities)	(7)	(3)
Net deferred tax asset	$ 4	$ 1