Supplemental financial statement information - Cash, Cash Equivalents And Restricted Cash (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 65,994		$ 126,221
Restricted cash	$ 10,789		$ 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	$ 76,783	$ 55,305	$ 137,347	$ 158,737
Cash paid for interest	43,817	43,343
Cash paid for income taxes	103	49
Non-cash investing and financing activities:
Liabilities incurred in connection with acquisitions		2,007
Change in accruals for property, plant and equipment additions	56	(172)
Lease liabilities arising from operating ROU assets	5,078	1,140
Lease liabilities arising from finance ROU assets	1,397
Accrued senior preferred units distributions	17,964	16,251
Ferrellgas, L.P
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	65,890		126,119
Restricted cash	10,789		11,126
Cash, cash equivalents and restricted cash	76,679	55,033	$ 137,245	$ 158,466
Cash paid for interest	43,817	43,343
Cash paid for income taxes	85	49
Non-cash investing and financing activities:
Liabilities incurred in connection with acquisitions		2,007
Change in accruals for property, plant and equipment additions	56	(172)
Lease liabilities arising from operating ROU assets	5,078	1,140
Lease liabilities arising from finance ROU assets	1,397
Accrued senior preferred units distributions	$ 17,964	$ 16,251