Supplemental Information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 121,558	$ 119,991	$ 364,334	$ 351,541
Depreciation and amortization expense	20,366	20,617	59,380	59,214
Operating expense - equipment lease expense	8,075		24,724
Equipment lease expense, preadoption		8,319		24,597
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	121,558	119,991	364,334	351,541
Depreciation and amortization expense	20,366	20,617	59,380	59,214
Operating expense - equipment lease expense	8,075		24,724
Equipment lease expense, preadoption		8,319		24,597
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	54,664	54,753	167,666	162,474
Depreciation and amortization expense	2,007	1,934	5,883	4,396
Operating expense - equipment lease expense	8,308		23,934
Equipment lease expense, preadoption		7,784		23,172
Costs and Expenses, Total	64,979	64,471	197,483	190,042
Shipping and Handling [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	54,664	54,753	167,666	162,474
Depreciation and amortization expense	2,007	1,934	5,883	4,396
Operating expense - equipment lease expense	8,308		23,934
Equipment lease expense, preadoption		7,784		23,172
Costs and Expenses, Total	$ 64,979	$ 64,471	$ 197,483	$ 190,042