Partners' Capital (Narrative) (Details) (USD $)	1 Months Ended		3 Months Ended	12 Months Ended							12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended
	Aug. 31, 2011	Nov. 30, 2010	Jul. 31, 2011	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] Fixed Rate, 8.625%, Due 2020 [Member]	Jul. 31, 2011 Fixed Rate, 8.625%, Due 2020 [Member]	Mar. 31, 2011 Fixed Rate, 8.625%, Due 2020 [Member]	Apr. 30, 2010 Fixed Rate, 8.625%, Due 2020 [Member]	Jul. 31, 2011 Original Offering [Member]	Jul. 31, 2011 Over Allotment Offering [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] Ferrellgas Partners [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] Ferrellgas Partners [Member]	Jul. 31, 2011 Ferrellgas Partners [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] General Partner [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] General Partner [Member]	Dec. 31, 2010 Ferrellgas, L.P. And Subsidiaries [Member] General Partner [Member]	Jul. 31, 2011 General Partner [Member]	Jul. 31, 2010 General Partner [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member]	Dec. 31, 2010 Ferrellgas, L.P. And Subsidiaries [Member]	Jul. 31, 2010 Ferrellgas, L.P. And Subsidiaries [Member]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest															98.00%		1.0101%		2.00%
Minimum percentage ownership of outstanding common units resulting in non voting of owners				20.00%
Cash distribution declared date			August 26, 2011																		August 26, 2011
Cash distributions declared per common unit	$ 0.50
Cash distributions, payment date			September 14, 2011																		September 14, 2011
Distribution payable, amount													$ 38,400,000	$ 38,400,000		$ 400,000	$ 400,000
Distribution paid, amount													0			0
Cash received from contributions														157,700,000			1,600,000	500,000	3,300,000	500,000
Non-cash contributions																	200,000	200,000	500,000	300,000
Cash contributions																								51,300,000
Net asset contributions related to acquisitions																						2,900,000	3,100,000
Public offering for common units		1,200,000		5,100,000	1,100,000						4,400,000	700,000
Proceeds from equity offering				157,212,000	19,949,000	69,447,000
Net proceeds				127,300,000
Net proceeds used to reduce outstanding debt		30,000,000			20,000,000
Ferrellgas issued common units				100,000	200,000
Value of new issues of common stock during period				2,900,000	3,100,000
Distributions paid to partners														107,900,000					384,000
Debt redeemed							98,000,000	98,000,000	98,000,000
Debt instrument, face amount							280,000,000	280,000,000	280,000,000	280,000,000
Debt instrument, interest rate							8.625%	8.625%	8.625%	8.625%
Debt maturity year							2020	2020	2020	2020
Debt instrument, make whole payment								8,400,000	8,400,000
Accrued interest paid								$ 2,400,000	$ 2,400,000