Supplemental Information - Shipping and Handling (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 493,055	$ 468,868	$ 471,748
Depreciation and amortization expense	80,481	78,846	101,795
Operating expense - equipment lease expense	33,017
Equipment lease expense, preadoption		33,073	28,272
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	219,598	215,780	195,646
Depreciation and amortization expense	9,857	6,375	4,947
Operating expense - equipment lease expense	32,518
Equipment lease expense, preadoption		30,759	25,765
Costs and Expenses, Total	261,973	252,914	226,358
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	493,055	468,868	471,748
Depreciation and amortization expense	80,481	78,846	101,795
Operating expense - equipment lease expense	33,017
Equipment lease expense, preadoption		33,073	28,272
Ferrellgas, L.P. [Member] | Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	219,598	215,780	195,646
Depreciation and amortization expense	9,857	6,375	4,947
Operating expense - equipment lease expense	32,518
Equipment lease expense, preadoption		30,759	25,765
Costs and Expenses, Total	$ 261,973	$ 252,914	$ 226,358