Consolidated Statements Of Earnings - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Revenues:
Revenues	$ 573,377,000	$ 755,156,000	$ 925,686,000	$ 1,209,811,000
Costs and expenses:
Operating expense	121,219,000	123,716,000	231,550,000	234,178,000
Depreciation and amortization expense	19,605,000	25,485,000	38,597,000	51,217,000
General and administrative expense	16,342,000	14,891,000	30,521,000	28,055,000
Equipment lease expense	8,415,000	6,954,000	16,278,000	13,695,000
Non-cash employee stock ownership plan compensation charge	1,944,000	4,031,000	4,692,000	7,993,000
Asset impairment charges		10,005,000	0	10,005,000
Loss on asset sales and disposals	2,216,000	39,249,000	6,720,000	40,144,000
Operating income (loss)	88,683,000	40,053,000	75,192,000	32,410,000
Interest expense	(44,891,000)	(42,673,000)	(88,769,000)	(83,480,000)
Other income (expense), net	86,000	684,000	105,000	1,195,000
Earnings (loss) before income taxes	43,878,000	(1,936,000)	(13,472,000)	(49,875,000)
Income tax expense (benefit)	3,000	(162,000)	161,000	215,000
Net earnings (loss)	43,875,000	(1,774,000)	(13,633,000)	(50,090,000)
Net earnings (loss) attributable to noncontrolling interest	531,000	69,000	38,000	(332,000)
Net earnings (loss)	43,344,000	(1,843,000)	(13,671,000)	(49,758,000)
Less: General partner's interest in net earnings (loss)	433,000	(19,000)	(137,000)	(498,000)
Common unitholders' interest in net earnings (loss)	$ 42,911,000	$ (1,824,000)	$ (13,534,000)	$ (49,260,000)
Basic and diluted net earnings (loss) per common unit	$ 0.44	$ (0.02)	$ (0.14)	$ (0.51)
Distributions declared or paid per unit	$ 0.00	$ 0.10	$ 0.00	$ 0.20
Propane [Member]
Revenues:
Revenues	$ 550,112,000	$ 592,239,000	$ 885,078,000	$ 894,997,000
Costs and expenses:
Cost of sales	311,531,000	362,918,000	515,667,000	542,433,000
Midstream Operations [Member]
Revenues:
Revenues	0	117,276,000	0	238,036,000
Costs and expenses:
Cost of sales	0	107,067,000	0	215,192,000
Product and Service, Other [Member]
Revenues:
Revenues	23,265,000	45,641,000	40,608,000	76,778,000
Costs and expenses:
Cost of sales	3,422,000	20,787,000	6,469,000	34,489,000
Ferrellgas Partners Finance Corp. [Member]
Costs and expenses:
General and administrative expense	1,941	225	1,941	275
Net earnings (loss)	(1,941)	(225)	(1,941)	(275)
Ferrellgas, L.P. [Member]
Revenues:
Revenues	573,377,000	755,156,000	925,686,000	1,209,811,000
Costs and expenses:
Operating expense	121,219,000	123,716,000	231,550,000	234,178,000
Depreciation and amortization expense	19,605,000	25,485,000	38,597,000	51,217,000
General and administrative expense	16,341,000	14,890,000	30,516,000	28,054,000
Equipment lease expense	8,415,000	6,954,000	16,278,000	13,695,000
Non-cash employee stock ownership plan compensation charge	1,944,000	4,031,000	4,692,000	7,993,000
Asset impairment charges		10,005,000	0	10,005,000
Loss on asset sales and disposals	2,216,000	39,249,000	6,720,000	40,144,000
Operating income (loss)	88,684,000	40,054,000	75,197,000	32,411,000
Interest expense	(36,150,000)	(34,058,000)	(71,345,000)	(66,254,000)
Other income (expense), net	86,000	684,000	105,000	1,195,000
Earnings (loss) before income taxes	52,620,000	6,680,000	3,957,000	(32,648,000)
Income tax expense (benefit)	3,000	(167,000)	154,000	204,000
Net earnings (loss)	52,617,000	6,847,000	3,803,000	(32,852,000)
Net earnings (loss)	52,617,000	6,847,000	3,803,000	(32,852,000)
Ferrellgas, L.P. [Member] | Propane [Member]
Revenues:
Revenues	550,112,000	592,239,000	885,078,000	894,997,000
Costs and expenses:
Cost of sales	311,531,000	362,918,000	515,667,000	542,433,000
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Revenues:
Revenues	0	117,276,000	0	238,036,000
Costs and expenses:
Cost of sales	0	107,067,000	0	215,192,000
Ferrellgas, L.P. [Member] | Product and Service, Other [Member]
Revenues:
Revenues	23,265,000	45,641,000	40,608,000	76,778,000
Costs and expenses:
Cost of sales	3,422,000	20,787,000	6,469,000	34,489,000
Ferrellgas Finance Corp. [Member]
Costs and expenses:
General and administrative expense	3,850	3,666	5,400	5,216
Net earnings (loss)	$ (3,850)	$ (3,666)	$ (5,400)	$ (5,216)