Consolidated Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Revenues:
Revenues	$ 510,833,000	$ 573,377,000	$ 804,047,000	$ 925,686,000
Costs and expenses:
Operating expense - personnel, vehicle, plant and other	128,233,000	121,219,000	242,776,000	231,550,000
Operating expense - equipment lease expense	8,261,000		16,649,000
Equipment lease expense, preadoption		8,415,000		16,278,000
Depreciation and amortization expense	19,795,000	19,605,000	39,014,000	38,597,000
General and administrative expense	14,192,000	16,342,000	23,887,000	30,521,000
Non-cash employee stock ownership plan compensation charge	630,000	1,944,000	1,425,000	4,692,000
Loss on asset sales and disposals	2,148,000	2,216,000	4,383,000	6,720,000
Operating income	96,378,000	88,683,000	97,008,000	75,192,000
Interest expense	(47,548,000)	(44,891,000)	(93,245,000)	(88,769,000)
Other income (expense), net	76,000	86,000	(56,000)	105,000
Loss before income taxes	48,906,000	43,878,000	3,707,000	(13,472,000)
Income tax expense	115,000	3,000	633,000	161,000
Net earnings (loss)	48,791,000	43,875,000	3,074,000	(13,633,000)
Net earnings (loss) attributable to noncontrolling interest	584,000	531,000	211,000	38,000
Net earnings (loss)	48,207,000	43,344,000	2,863,000	(13,671,000)
Less: General partner's interest in net earnings (loss)	482,000	433,000	29,000	(137,000)
Common unitholders' interest in net earnings ( loss)	$ 47,725,000	$ 42,911,000	$ 2,834,000	$ (13,534,000)
Basic and diluted net earnings (loss) per common unit	$ 0.49	$ 0.44	$ 0.03	$ (0.14)
Cash distributions declared or paid per unit	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Propane [Member]
Revenues:
Revenues	$ 485,247,000	$ 550,112,000	$ 758,632,000	$ 885,078,000
Costs and expenses:
Cost of sales	237,843,000	311,531,000	371,871,000	515,667,000
Other Revenues
Revenues:
Revenues	25,586,000	23,265,000	45,415,000	40,608,000
Costs and expenses:
Cost of sales	3,353,000	3,422,000	7,034,000	6,469,000
Ferrellgas Partners Finance Corp. [Member]
Costs and expenses:
General and administrative expense		1,941	891	1,941
Net earnings (loss)		(1,941)	(891)	(1,941)
Ferrellgas, L.P. [Member]
Revenues:
Revenues	510,833,000	573,377,000	804,047,000	925,686,000
Costs and expenses:
Operating expense - personnel, vehicle, plant and other	128,233,000	121,219,000	242,776,000	231,550,000
Operating expense - equipment lease expense	8,261,000		16,649,000
Equipment lease expense, preadoption		8,415,000		16,278,000
Depreciation and amortization expense	19,795,000	19,605,000	39,014,000	38,597,000
General and administrative expense	14,085,000	16,341,000	23,781,000	30,516,000
Non-cash employee stock ownership plan compensation charge	630,000	1,944,000	1,425,000	4,692,000
Loss on asset sales and disposals	2,148,000	2,216,000	4,383,000	6,720,000
Operating income	96,485,000	88,684,000	97,114,000	75,197,000
Interest expense	(38,690,000)	(36,150,000)	(75,567,000)	(71,345,000)
Other income (expense), net	76,000	86,000	(56,000)	105,000
Loss before income taxes	57,871,000	52,620,000	21,491,000	3,957,000
Income tax expense	115,000	3,000	633,000	154,000
Net earnings (loss)	57,756,000	52,617,000	20,858,000	3,803,000
Ferrellgas, L.P. [Member] | Propane [Member]
Revenues:
Revenues	485,247,000	550,112,000	758,632,000	885,078,000
Costs and expenses:
Cost of sales	237,843,000	311,531,000	371,871,000	515,667,000
Ferrellgas, L.P. [Member] | Other Revenues
Revenues:
Revenues	25,586,000	23,265,000	45,415,000	40,608,000
Costs and expenses:
Cost of sales	3,353,000	3,422,000	7,034,000	6,469,000
Ferrellgas Finance Corp. [Member]
Costs and expenses:
General and administrative expense	2,888,000	3,850,000	3,906	5,400
Net earnings (loss)	$ (2,888,000)	$ (3,850,000)	$ (3,906)	$ (5,400)