Supplemental Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
Supplemental Financial Statement Information [Line Items]
Accrued interest	$ 68,668	$ 53,841
Customer deposits and advances	40,898	32,257
Accrued payroll	13,431	18,375
Accrued insurance	10,994	14,796
Price risk management liabilities	1,506	5,029
Other	51,441	43,168
Other current liabilities	186,938	167,466
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Accrued interest	41,640	34,511
Customer deposits and advances	40,898	32,257
Accrued payroll	13,431	18,375
Accrued insurance	10,994	14,796
Price risk management liabilities	1,506	5,029
Other	51,441	43,168
Other current liabilities	$ 159,910	$ 148,136