Summary of significant accounting policies - Summary Of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Significant Accounting Policies [Line Items]
Current expense	$ 1,369	$ 689	$ 984
Deferred expense (benefit)	3	(3)	(3)
Income tax expense	1,372	686	981
Ferrellgas, L.P.
Significant Accounting Policies [Line Items]
Current expense	1,315	637	979
Deferred expense (benefit)	3	(3)	(3)
Income tax expense	$ 1,318	$ 634	$ 976