Supplemental financial statement information - Cash, Cash Equivalents And Restricted Cash (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 44,173		$ 147,529
Restricted cash	$ 11,132		$ 11,208
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Cash, cash equivalents and restricted cash		Cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash	$ 55,305	$ 168,851	$ 158,737	$ 281,952
Cash paid for interest	43,343	44,152
Cash paid for income taxes	49
Non-cash investing and financing activities:
Liabilities incurred in connection with acquisitions	2,007	644
Change in accruals for property, plant and equipment additions	(172)	65
Lease liabilities arising from operating right-of-use assets	1,140	7,558
Lease liabilities arising from finance right-of-use assets		812
Accrued senior preferred units distributions	16,251	17,005
Ferrellgas, L.P
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	43,901		147,258
Restricted cash	11,132		11,208
Cash, cash equivalents and restricted cash	$ 55,033	$ 168,611	$ 158,466	$ 281,688