Supplemental Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Accrued interest	$ 53,192	$ 20,484
Customer deposits and advances	23,785	24,686
Accrued payroll	27,999	17,356
Accrued insurance	12,519	18,524
Price risk management liabilities	18,378	14,198
Other	38,950	42,989
Other current liabilities	174,823	138,237
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Accrued interest	41,560	16,550
Customer deposits and advances	23,785	24,686
Accrued payroll	27,999	17,356
Accrued insurance	12,519	18,524
Price risk management liabilities	18,378	14,198
Other	38,950	42,989
Other current liabilities	$ 163,191	$ 134,303