Supplemental Financial Statement Information - Shipping and Handling (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Supplemental Financial Statement Information [Line Items]
Operating expense	$ 468,868	$ 471,748	$ 432,412
Depreciation and amortization expense	78,846	101,795	103,351
Equipment lease expense	33,073	28,272	29,124
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	468,868	471,748	432,412
Depreciation and amortization expense	78,846	101,795	103,351
Equipment lease expense	33,073	28,272	29,124
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	215,780	195,646	175,164
Depreciation and amortization expense	6,375	4,947	3,909
Equipment lease expense	30,759	25,765	26,299
Costs and Expenses, Total	252,914	226,358	205,372
Shipping and Handling [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	215,780	195,646	175,164
Depreciation and amortization expense	6,375	4,947	3,909
Equipment lease expense	30,759	25,765	26,299
Costs and Expenses, Total	$ 252,914	$ 226,358	$ 205,372