Supplemental Information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 109,027	$ 114,543
Depreciation and amortization expense	21,390	19,219
Operating expense - equipment lease expense	6,830	8,388
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	47,531	48,015
Depreciation and amortization expense	4,523	1,840
Operating expense - equipment lease expense	5,883	7,642
Costs and Expenses, Total	57,937	57,497
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	109,027	114,543
Depreciation and amortization expense	21,390	19,219
Operating expense - equipment lease expense	6,830	8,388
Ferrellgas, L.P. [Member] | Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	47,531	48,015
Depreciation and amortization expense	4,523	1,840
Operating expense - equipment lease expense	5,883	7,642
Costs and Expenses, Total	$ 57,937	$ 57,497