Quarterly Data (Details) (USD $)	3 Months Ended												12 Months Ended
	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010		Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Revenues	$ 341,775,000	$ 629,619,000	$ 829,272,000	$ 538,426,000	$ 341,775,000		$ 629,619,000		$ 829,272,000		$ 538,426,000		$ 2,339,092,000	$ 2,423,215,000	$ 2,099,060,000
Gross margin from propane and other gas liquids sales	113,872,000	155,123,000	178,967,000	111,097,000	113,872,000	[1]	155,123,000	[1]	178,967,000	[1]	111,097,000	[1]
Net earnings (loss)	(35,850,000)	21,062,000	36,787,000	(32,895,000)	(35,850,000)		21,062,000		36,787,000		(32,895,000)		(10,896,000)	(43,760,000)	33,339,000
Net earnings (loss) attributable to Ferrellgas Partners, L.P.	(35,529,000)	20,807,000	36,374,000	(32,604,000)	(35,529,000)		20,807,000		36,374,000		(32,604,000)		(10,952,000)	(43,648,000)	32,709,000
Common unitholders' interest in net earnings (loss)	(35,173,000)	20,599,000	36,010,000	(32,278,000)	(35,173,000)		20,599,000		36,010,000		(32,278,000)		(10,842,000)	(43,212,000)	32,382,000
Basic and diluted net earnings (loss) per common unitholders' interest	$ (0.45)	$ 0.26	$ 0.47	$ (0.42)	$ (0.45)		$ 0.26		$ 0.47		$ (0.42)		$ (0.14)	$ (0.60)	$ 0.47
Loss on extinguishment of debt							10,600,000		36,400,000					27,463,000
Loss on extinguishment of debt, per share							$ 0.14		$ 0.50
Legal fees							10,500,000
Legal fees, per share							$ 0.14
Ferrellgas Partners, L.P. [Member]
Loss on extinguishment of debt							10,500,000		36,100,000
Legal fees							10,400,000
Common Unitholders [Member]
Loss on extinguishment of debt							10,400,000		35,700,000
Legal fees							10,300,000
Ferrellgas, L.P. [Member]
Revenues	341,775,000	629,619,000	829,272,000	538,426,000	341,775,000		629,619,000		829,272,000		538,426,000		2,339,092,000	2,423,215,000	2,099,060,000
Gross margin from propane and other gas liquids sales	113,872,000	155,123,000	178,967,000	111,097,000	113,872,000	[2]	155,123,000	[2]	178,967,000	[2]	111,097,000	[2]
Net earnings (loss)	(31,746,000)	25,253,000	40,884,000	(28,802,000)	(31,746,000)		25,253,000		40,884,000		(28,802,000)		5,589,000	(11,062,000)	62,361,000
Loss on extinguishment of debt			36,400,000											25,403,000
Legal fees							$ 10,500,000

[1] Gross margin from “Propane and other gas liquids sales” represents “Revenues - Propane and other gas liquids sales” less “Cost of product sold - propane and other gas liquids sales.

[2] For the year ended July 31, 2011FirstquarterSecondquarter (b)Thirdquarter (c)FourthquarterRevenues$ 400,192$ 840,992$ 732,373$ 449,658Gross margin from propane and other gas liquids sales (a) 112,137 214,763 164,608 111,405Net earnings (loss)$ (21,999)$ 28,688$ 19,416$ (37,167)Gross margin from “Propane and other gas liquids sales” represents “Revenues - Propane and other gas liquids sales” less “Cost of product sold - propane and other gas liquids sales.