Supplemental financial statement information - Prepaids and Other Assets Net (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jul. 31, 2021
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 12,338	$ 21,068
Other assets	18,426	18,024
Prepaid expenses and other current assets	30,764	39,092
Notes receivable, less current portion and allowance	415	19,765
Finance lease right-of-use assets	31,421	34,858
Other	47,408	38,605
Other assets, net	79,244	93,228
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	12,338	21,068
Other assets	18,405	18,005
Prepaid expenses and other current assets	30,743	39,073
Other assets, net	$ 79,244	$ 93,228