Consolidated Statements Of Operations - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Revenues:
Revenues	$ 1,497,826,000	$ 1,684,392,000	$ 2,073,142,000
Costs and expenses:
Operating expense - personnel, vehicle, plant and other	493,055,000	468,868,000	471,748,000
Operating expense - equipment lease expense	33,017,000
Equipment lease expense, preadoption		33,073,000	28,272,000
Depreciation and amortization expense	80,481,000	78,846,000	101,795,000
General and administrative expense	45,752,000	59,994,000	54,401,000
Non-cash employee stock ownership plan compensation charge	2,871,000	5,693,000	13,859,000
Asset impairments	0	0	10,005,000
Loss on asset sales and disposals	7,924,000	10,968,000	187,399,000
Operating income	148,670,000	113,028,000	(91,964,000)
Interest expense	(192,962,000)	(177,619,000)	(168,467,000)
Loss on extinguishment of debt	(37,399,000)
Other income (expense), net	(460,000)	369,000	928,000
Loss before income taxes	(82,151,000)	(64,222,000)	(259,503,000)
Income tax expense (benefit)	851,000	323,000	(2,678,000)
Net loss	(83,002,000)	(64,545,000)	(256,825,000)
Net loss attributable to noncontrolling interest	(503,000)	(298,000)	(2,244,000)
Net loss	(82,499,000)	(64,247,000)	(254,581,000)
Less: General partner's interest in net loss	(825,000)	(642,000)	(2,546,000)
Common unitholders' interest in net loss	$ (81,674,000)	$ (63,605,000)	$ (252,035,000)
Basic and diluted net loss per common unit	$ (0.84)	$ (0.65)	$ (2.59)
Cash distributions declared or paid per unit			$ 0.40
Propane [Member]
Revenues:
Revenues	$ 1,415,791,000	$ 1,608,858,000	$ 1,642,976,000
Costs and expenses:
Cost of sales	673,053,000	902,516,000	973,414,000
Midstream Operations [Member]
Revenues:
Revenues			282,319,000
Costs and expenses:
Cost of sales			255,559,000
Other Revenues
Revenues:
Revenues	82,035,000	75,534,000	147,847,000
Costs and expenses:
Cost of sales	13,003,000	11,406,000	68,654,000
Ferrellgas Partners Finance Corp. [Member]
Costs and expenses:
General and administrative expense	5,827	3,999	2,115
Net loss	(5,827)	(3,999)	(2,115)
Ferrellgas, L.P. [Member]
Revenues:
Revenues	1,497,826,000	1,684,392,000	2,073,142,000
Costs and expenses:
Operating expense - personnel, vehicle, plant and other	493,055,000	468,868,000	471,748,000
Operating expense - equipment lease expense	33,017,000
Equipment lease expense, preadoption		33,073,000	28,272,000
Depreciation and amortization expense	80,481,000	78,846,000	101,795,000
General and administrative expense	45,636,000	59,980,000	54,264,000
Non-cash employee stock ownership plan compensation charge	2,871,000	5,693,000	13,859,000
Asset impairments			10,005,000
Loss on asset sales and disposals	7,924,000	10,968,000	187,399,000
Operating income	148,786,000	113,042,000	(91,827,000)
Interest expense	(159,889,000)	(142,635,000)	(133,946,000)
Loss on extinguishment of debt	(37,399,000)
Other income (expense), net	(460,000)	369,000	928,000
Loss before income taxes	(48,962,000)	(29,224,000)	(224,845,000)
Income tax expense (benefit)	802,000	293,000	(2,699,000)
Equity in earnings (loss) of Ferrellgas, L.P.	0	0	0
Net loss	(49,764,000)	(29,517,000)	(222,146,000)
Ferrellgas, L.P. [Member] | Propane [Member]
Revenues:
Revenues	1,415,791,000	1,608,858,000	1,642,976,000
Costs and expenses:
Cost of sales	673,053,000	902,516,000	973,414,000
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Revenues:
Revenues			282,319,000
Costs and expenses:
Cost of sales			255,559,000
Ferrellgas, L.P. [Member] | Other Revenues
Revenues:
Revenues	82,035,000	75,534,000	147,847,000
Costs and expenses:
Cost of sales	13,003,000	11,406,000	68,654,000
Ferrellgas Finance Corp. [Member]
Costs and expenses:
General and administrative expense	6,010	5,625	5,216
Net loss	$ (6,010)	$ (5,625)	$ (5,216)