Supplemental financial statement information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jul. 31, 2021
Supplemental Financial Statement Information [Line Items]
Accrued interest	$ 29,703	$ 29,095
Customer deposits and advances	33,189	35,734
Accrued payroll	29,717	28,143
Accrued insurance	16,114	11,104
Broker margin deposit liability	32,805	79,178
Accrued senior preferred units distributions	17,466	16,013
Other	59,616	46,733
Other current liabilities	218,610	246,000
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Accrued interest	29,703	29,095
Customer deposits and advances	33,189	35,734
Accrued payroll	29,717	28,143
Accrued insurance	16,114	11,104
Broker margin deposit liability	32,805	79,178
Accrued senior preferred units distributions	17,466	16,013
Other	59,339	46,515
Other current liabilities	$ 218,333	$ 245,782