Supplemental Financial Statement Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Accrued interest	$ 54,651	$ 20,484
Customer deposits and advances	35,625	24,686
Accrued payroll	23,918	17,356
Accrued insurance	13,980	18,524
Price risk management liabilities	19,745	14,198
Other	39,812	42,989
Other current liabilities	187,731	138,237
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Accrued interest	43,019	16,550
Customer deposits and advances	35,625	24,686
Accrued payroll	23,918	17,356
Accrued insurance	13,980	18,524
Price risk management liabilities	19,745	14,198
Other	39,812	42,989
Other current liabilities	$ 176,099	$ 134,303