Condensed Consolidated Statements Of Partners' Capital (USD $)	Ferrellgas, L.P. [Member] Common Unitholders [Member]	Ferrellgas, L.P. [Member] General Partner [Member]	Ferrellgas, L.P. [Member] Risk Management [Member]	Ferrellgas, L.P. [Member] Currency Translation Adjustments [Member]	Ferrellgas, L.P. [Member] Pension Liability [Member]	Ferrellgas, L.P. [Member]	Common Unitholders [Member]	General Partner [Member]	Risk Management [Member]	Currency Translation Adjustments [Member]	Pension Liability [Member]	Total Ferrellgas Partners, L.P. Partners' Capital [Member]	Non-Controlling Interest [Member]	Total
Value at Jul. 31, 2010							$ 141,281,000	$ (58,644,000)	$ (166,000)	$ 24,000	$ (273,000)	$ 82,222,000	$ 3,680,000	$ 85,902,000
Shares at Jul. 31, 2010							69,521,800	702,200
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges							17,108,000	173,000	0	0	0	17,281,000	176,000	17,457,000
Distributions						(83,818,000)	(70,187,000)	(709,000)	0	0	0	(70,896,000)	(847,000)	(71,743,000)
Common units issued in connection with acquisitions - shares							63,500	600
Common units issued in connection with acquisitions - value	1,625,000						1,625,000	16,000	0	0	0	1,641,000	17,000	1,658,000
Common unit options issued - shares							27,400	300
Common unit options issued - value							317,000	3,000	0	0	0	320,000	3,000	323,000
Common units issued in offering, net of issuance costs - shares							1,215,100	12,300
Common units issued in offering, net of issuance costs - value							29,950,000	303,000	0	0	0	30,253,000	306,000	30,559,000
Comprehensive income (loss):
Net earnings (loss)						6,689,000	(5,855,000)	(59,000)	0	0	0	(5,914,000)	68,000	(5,846,000)
Cumulative effect of change in accounting principle							1,230,000	12,000	0	0	0	1,242,000	13,000	1,255,000
Other comprehensive income (loss):
Net earnings (loss) on risk management derivatives							0	0	11,660,000	0	0		120,000
Reclassification of derivatives to earnings							0	0	(3,207,000)	0	0		(33,000)
Foreign currency translation adjustment							0	0	0	2,000	0
Other comprehensive income (loss)												8,455,000		8,542,000
Comprehensive income (loss)												3,783,000	168,000	3,951,000
Value at Jan. 31, 2011							115,469,000	(58,905,000)	8,287,000	26,000	(273,000)	64,604,000	3,503,000	68,107,000
Shares at Jan. 31, 2011							70,827,800	715,400
Value at Jul. 31, 2011	261,323,000	2,669,000	5,161,000	26,000	(493,000)	268,686,000	139,614,000	(58,660,000)	5,098,000	26,000	(491,000)	85,587,000	2,730,000	88,317,000
Shares at Jul. 31, 2011							75,966,400	767,300
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges	8,907,000	91,000	0	0	0	8,998,000	8,818,000	89,000	0	0	0	8,907,000	91,000	8,998,000
Cash contributed by Ferrellgas Partners and general partner	50,000,000	510,000	0	0	0	50,510,000
Distributions	(84,587,000)	(863,000)	0	0	0	(85,450,000)	(75,970,000)	(768,000)	0	0	0	(76,738,000)	(863,000)	(77,601,000)
Common units issued in connection with acquisitions - shares							68,200	700
Common units issued in connection with acquisitions - value	1,300,000	13,000	0	0	0	1,313,000	1,300,000	13,000	0	0	0	1,313,000	13,000	1,326,000
Common unit options issued - shares							20,500	200
Common unit options issued - value							239,000	2,000	0	0	0	241,000	1,000	242,000
Common units issued in offering, net of issuance costs - shares							2,895,400	29,300
Common units issued in offering, net of issuance costs - value							49,775,000	502,000	0	0	0	50,277,000	510,000	50,787,000
Comprehensive income (loss):
Net earnings (loss)	11,960,000	122,000	0	0	0	12,082,000	3,732,000	38,000	0	0	0	3,770,000	122,000	3,892,000
Other comprehensive income (loss):
Net earnings (loss) on risk management derivatives	0	0	(3,875,000)	0	0		0	0	(3,836,000)	0	0		(39,000)
Reclassification of derivatives to earnings	0	0	(2,713,000)	0	0		0	0	(2,686,000)	0	0		(27,000)
Foreign currency translation adjustment	0	0	0	0	0		0	0	0	0	0		0
Other comprehensive income (loss)						(6,588,000)						(6,522,000)		(6,588,000)
Comprehensive income (loss)						5,494,000						(2,752,000)	56,000	(2,696,000)
Value at Jan. 31, 2012	248,903,000	2,542,000	(1,427,000)	26,000	(493,000)	249,551,000	127,508,000	(58,784,000)	(1,424,000)	26,000	(491,000)	66,835,000	2,538,000	69,373,000
Shares at Jan. 31, 2012							78,950,500	797,500
Value at Oct. 31, 2011
Distributions						(46,692,000)
Comprehensive income (loss):
Net earnings (loss)						40,884,000								36,787,000
Value at Jan. 31, 2012						$ 249,551,000								$ 69,373,000