Consolidated Statements Of Earnings - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenues:
Revenues	$ 479,625,000	$ 515,810,000	$ 1,405,311,000	$ 1,725,621,000
Costs and expenses:
Operating expense	119,991,000	116,579,000	351,541,000	350,757,000
Depreciation and amortization expense	20,617,000	25,348,000	59,214,000	76,565,000
General and administrative expense	11,516,000	11,678,000	42,037,000	39,733,000
Equipment lease expense	8,319,000	7,133,000	24,597,000	20,828,000
Non-cash employee stock ownership plan compensation charge	(4,000)	2,738,000	4,688,000	10,731,000
Asset impairment charges				10,005,000
Loss on asset sales and disposals	1,683,000	6,270,000	8,403,000	46,414,000
Operating income (loss)	64,794,000	51,277,000	139,986,000	83,687,000
Interest expense	(44,162,000)	(40,375,000)	(132,931,000)	(123,855,000)
Other income (expense), net	251,000	227,000	356,000	1,422,000
Earnings (loss) before income taxes	20,883,000	11,129,000	7,411,000	(38,746,000)
Income tax expense	123,000	67,000	284,000	282,000
Net earnings (loss)	20,760,000	11,062,000	7,127,000	(39,028,000)
Net earnings (loss) attributable to noncontrolling interest	299,000	201,000	337,000	(131,000)
Net earnings (loss)	20,461,000	10,861,000	6,790,000	(38,897,000)
Less: General partner's interest in net earnings (loss)	205,000	109,000	68,000	(389,000)
Common unitholders' interest in net earnings (loss)	$ 20,256,000	$ 10,752,000	$ 6,722,000	$ (38,508,000)
Basic and diluted net earnings (loss) per common unit	$ 0.21	$ 0.11	$ 0.07	$ (0.40)
Distributions declared or paid per unit	$ 0.00	$ 0.10	$ 0.00	$ 0.30
Propane [Member]
Revenues:
Revenues	$ 459,556,000	$ 451,302,000	$ 1,344,634,000	$ 1,346,299,000
Costs and expenses:
Cost of sales	250,389,000	260,419,000	766,056,000	802,852,000
Midstream Operations [Member]
Revenues:
Revenues		22,595,000		260,631,000
Costs and expenses:
Cost of sales		14,518,000		229,710,000
Product and Service, Other [Member]
Revenues:
Revenues	20,069,000	41,913,000	60,677,000	118,691,000
Costs and expenses:
Cost of sales	2,320,000	19,850,000	8,789,000	54,339,000
Ferrellgas Partners Finance Corp. [Member]
Costs and expenses:
General and administrative expense	1,725	1,840	3,666	2,115
Net earnings (loss)	(1,725)	(1,840)	(3,666)	(2,115)
Ferrellgas, L.P. [Member]
Revenues:
Revenues	479,625,000	515,810,000	1,405,311,000	1,725,621,000
Costs and expenses:
Operating expense	119,991,000	116,579,000	351,541,000	350,757,000
Depreciation and amortization expense	20,617,000	25,348,000	59,214,000	76,565,000
General and administrative expense	11,512,000	11,546,000	42,028,000	39,600,000
Equipment lease expense	8,319,000	7,133,000	24,597,000	20,828,000
Non-cash employee stock ownership plan compensation charge	(4,000)	2,738,000	4,688,000	10,731,000
Asset impairment charges				10,005,000
Loss on asset sales and disposals	1,683,000	6,270,000	8,403,000	46,414,000
Operating income (loss)	64,798,000	51,409,000	139,995,000	83,820,000
Interest expense	(35,395,000)	(31,739,000)	(106,740,000)	(97,993,000)
Other income (expense), net	251,000	227,000	356,000	1,422,000
Earnings (loss) before income taxes	29,654,000	19,897,000	33,611,000	(12,751,000)
Income tax expense	100,000	57,000	254,000	261,000
Net earnings (loss)	29,554,000	19,840,000	33,357,000	(13,012,000)
Net earnings (loss)	29,554,000	19,840,000	33,357,000	(13,012,000)
Ferrellgas, L.P. [Member] | Propane [Member]
Revenues:
Revenues	459,556,000	451,302,000	1,344,634,000	1,346,299,000
Costs and expenses:
Cost of sales	250,389,000	260,419,000	766,056,000	802,852,000
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Revenues:
Revenues		22,595,000		260,631,000
Costs and expenses:
Cost of sales		14,518,000		229,710,000
Ferrellgas, L.P. [Member] | Product and Service, Other [Member]
Revenues:
Revenues	20,069,000	41,913,000	60,677,000	118,691,000
Costs and expenses:
Cost of sales	2,320,000	$ 19,850,000	8,789,000	54,339,000
Ferrellgas Finance Corp. [Member]
Costs and expenses:
General and administrative expense	225		5,625	5,216
Net earnings (loss)	$ (225)		$ (5,625)	$ (5,216)