Supplemental Information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 115,247	$ 128,233	$ 224,274	$ 242,776
Depreciation and amortization expense	21,249	19,795	42,639	39,014
Operating expense - equipment lease expense	6,862	8,261	13,692	16,649
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	56,723	64,987	104,253	113,002
Depreciation and amortization expense	1,958	2,036	6,481	3,876
Operating expense - equipment lease expense	5,793	7,984	11,676	15,626
Costs and Expenses, Total	64,474	75,007	122,410	132,504
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	115,247	128,233	224,274	242,776
Depreciation and amortization expense	21,249	19,795	42,639	39,014
Operating expense - equipment lease expense	6,862	8,261	13,692	16,649
Ferrellgas, L.P. [Member] | Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	56,723	64,987	104,253	113,002
Depreciation and amortization expense	1,958	2,036	6,481	3,876
Operating expense - equipment lease expense	5,793	7,984	11,676	15,626
Costs and Expenses, Total	$ 64,474	$ 75,007	$ 122,410	$ 132,504