Supplemental financial statement information - Cash, Cash Equivalents And Restricted Cash (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Jul. 31, 2023	Jul. 31, 2022
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 62,862		$ 126,221
Restricted cash	$ 10,783		$ 11,126
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	$ 73,645	$ 104,657	$ 137,347	$ 158,737
Cash paid for interest	88,393	88,865
Cash paid for income taxes	495	713
Non-cash investing and financing activities:
Liabilities incurred in connection with acquisitions	1,585	3,435
Change in accruals for property, plant and equipment additions	1,259	331
Lease liabilities arising from operating ROU assets	16,526	6,254
Lease liabilities arising from finance ROU assets	3,884
Accrued senior preferred units distributions	16,935	16,870
Ferrellgas, L.P.
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	62,438		126,119
Restricted cash	10,783		11,126
Cash, cash equivalents and restricted cash	73,221	104,257	$ 137,245	$ 158,466
Cash paid for interest	88,393	88,865
Cash paid for income taxes	477	708
Non-cash investing and financing activities:
Liabilities incurred in connection with acquisitions	1,585	3,435
Change in accruals for property, plant and equipment additions	1,259	331
Lease liabilities arising from operating ROU assets	16,526	6,254
Lease liabilities arising from finance ROU assets	3,884
Accrued senior preferred units distributions	$ 16,935	$ 16,870