Supplemental Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Accrued interest	$ 53,841	$ 20,484
Customer deposits and advances	32,257	24,686
Accrued payroll	18,375	17,356
Accrued insurance	14,796	18,524
Price risk management liabilities	5,029	14,198
Other	43,168	42,989
Other current liabilities	167,466	138,237
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Accrued interest	34,511	16,550
Customer deposits and advances	32,257	24,686
Accrued payroll	18,375	17,356
Accrued insurance	14,796	18,524
Price risk management liabilities	5,029	14,198
Other	43,168	42,989
Other current liabilities	$ 148,136	$ 134,303