Acquisitions and dispositions - Fair Value Allocation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]
Goodwill, Name of Segment [Extensible Enumeration]	Propane and related equipment sales	Propane and related equipment sales	Propane and related equipment sales
Goodwill	$ 257,155	$ 257,006	$ 257,006
Business Combination, Series of Individually Immaterial Business Combinations | Propane and related equipment sales
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]
Customer tanks, buildings, land and other	2,024	3,263	10,027
Goodwill	149
Aggregate fair value of net assets acquired	4,391	18,084	27,558
Business Combination, Series of Individually Immaterial Business Combinations | Propane and related equipment sales | Customer Lists
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]
Finite-lived Intangible Assets Acquired	1,828	14,564	15,938
Business Combination, Series of Individually Immaterial Business Combinations | Propane and related equipment sales | Non-Compete Agreements
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]
Finite-lived Intangible Assets Acquired	390	257	$ 1,593
Ferrellgas, L.P.
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]
Goodwill	$ 257,155	$ 257,006