Consolidated Statements Of Earnings - USD ($)	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Revenues:
Propane and other gas liquids sales	$ 1,318,412,000	$ 1,202,368,000	$ 1,657,016,000
Midstream operations	466,703,000	625,238,000	107,189,000
Other	145,162,000	211,761,000	260,185,000
Total revenues	1,930,277,000	2,039,367,000	2,024,390,000
Costs and expenses:
Cost of product sold - propane and other gas liquids sales	694,155,000	564,433,000	977,224,000
Cost of sales - midstream operations	429,439,000	471,234,000	76,590,000
Cost of product sold - other	67,267,000	126,237,000	170,697,000
Operating expense	432,412,000	459,178,000	437,457,000
Depreciation and amortization expense	103,351,000	150,513,000	98,579,000
General and administrative expense	49,617,000	56,635,000	77,238,000
Equipment lease expense	29,124,000	28,833,000	24,273,000
Non-cash employee stock ownership plan compensation charge	15,088,000	27,595,000	24,713,000
Asset Impairment Charges	0	658,118,000	0
Loss on disposal of assets	14,457,000	30,835,000	7,099,000
Operating income (loss)	95,367,000	(534,244,000)	130,520,000
Interest expense	(152,485,000)	(137,937,000)	(100,396,000)
Other income (expense), net	1,474,000	110,000	(350,000)
Earnings (loss) before income taxes	(55,644,000)	(672,071,000)	29,774,000
Income tax expense	(1,143,000)	(36,000)	(315,000)
Net earnings (loss)	(54,501,000)	(672,035,000)	30,089,000
Net earnings (loss) attributable to noncontrolling interest	(294,000)	(6,620,000)	469,000
Net earnings (loss) attributable to Ferrellgas Partners, L.P.	(54,207,000)	(665,415,000)	29,620,000
Less: General partner's interest in net earnings (loss)	(542,000)	(6,654,000)	296,000
Common unitholders' interest in net earnings (loss)	$ (53,665,000)	$ (658,761,000)	$ 29,324,000
Basic and diluted net earnings (loss) per common unitholders' interest	$ (0.55)	$ (6.68)	$ 0.35
Cash distributions declared per common unit	$ 0.40	$ 2.05	$ 2.00
Ferrellgas Partners Finance Corp. [Member]
Costs and expenses:
General and administrative expense	$ 5,308	$ 2,262	$ 2,348
Net earnings (loss)	(5,308)	(2,262)	(2,348)
Ferrellgas, L.P. [Member]
Revenues:
Propane and other gas liquids sales	1,318,412,000	1,202,368,000	1,657,016,000
Midstream operations	466,703,000	625,238,000	107,189,000
Other	145,162,000	211,761,000	260,185,000
Total revenues	1,930,277,000	2,039,367,000	2,024,390,000
Costs and expenses:
Cost of product sold - propane and other gas liquids sales	694,155,000	564,433,000	977,224,000
Cost of sales - midstream operations	429,439,000	471,234,000	76,590,000
Cost of product sold - other	67,267,000	126,237,000	170,697,000
Operating expense	432,412,000	459,178,000	437,353,000
Depreciation and amortization expense	103,351,000	150,513,000	98,579,000
General and administrative expense	49,478,000	56,115,000	77,238,000
Equipment lease expense	29,124,000	28,833,000	24,273,000
Non-cash employee stock ownership plan compensation charge	15,088,000	27,595,000	24,713,000
Asset Impairment Charges	0	658,118,000	0
Loss on disposal of assets	14,457,000	30,835,000	7,099,000
Operating income (loss)	95,506,000	(533,724,000)	130,624,000
Interest expense	(127,188,000)	(121,818,000)	(84,227,000)
Loss on extinguishment of debt	0	0	0
Other income (expense), net	1,474,000	110,000	(354,000)
Earnings (loss) before income taxes	(30,208,000)	(655,432,000)	46,043,000
Income tax expense	(1,149,000)	(41,000)	(384,000)
Net earnings (loss)	(29,059,000)	(655,391,000)	46,427,000
Ferrellgas Finance Corp. [Member]
Costs and expenses:
General and administrative expense	5,516	7,053	4,108
Net earnings (loss)	$ (5,516)	$ (7,053)	$ (4,108)