Commitment (Details) (USD $)	1 Months Ended	12 Months Ended						1 Months Ended													1 Months Ended						1 Months Ended	12 Months Ended
	Oct. 31, 2009	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009	Apr. 30, 2010 Ferrellgas Partners Finance Corp. [Member] Senior Notes [Member]	Aug. 04, 2008 Ferrellgas Finance Corp. [Member] Senior Notes [Member]	Apr. 20, 2004 Ferrellgas Finance Corp. [Member] Senior Notes [Member]	Apr. 30, 2010 Ferrellgas Partners Finance Corp. [Member] Senior Unsecured Notes [Member]	Sep. 30, 2009 Ferrellgas Finance Corp. [Member] Senior Unsecured Notes [Member]	Sep. 30, 2009 Series D Notes [Member]	Sep. 30, 2009 Series E Note [Member]	Nov. 30, 2010 Ferrellgas, L.P. And Subsidiaries [Member] Fixed Rate, 6.75%, Due 2014 [Member]	Nov. 30, 2010 Ferrellgas Finance Corp. [Member] Fixed Rate, 6.75%, Due 2014 [Member]	Nov. 30, 2010 Fixed Rate, 6.75%, Due 2014 [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member] Fixed Rate, 6.50%, Due 2021 [Member]	Nov. 24, 2010 Ferrellgas, L.P. And Subsidiaries [Member] Fixed Rate, 6.50%, Due 2021 [Member]	Jul. 31, 2011 Ferrellgas Finance Corp. [Member] Fixed Rate, 6.50%, Due 2021 [Member]	Nov. 30, 2010 Ferrellgas Finance Corp. [Member] Fixed Rate, 6.50%, Due 2021 [Member]	Jul. 31, 2011 Fixed Rate, 6.50%, Due 2021 [Member]	Nov. 24, 2010 Fixed Rate, 6.50%, Due 2021 [Member]	Apr. 30, 2010 Ferrellgas Partners Finance Corp. [Member] Fixed Rate, 8.625%, Due 2020 [Member]	Mar. 31, 2011 Ferrellgas Partners Finance Corp. [Member] Fixed Rate, 8.625%, Due 2020 [Member]	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]	Oct. 31, 2009 Ferrellgas, L.P. And Subsidiaries [Member]	Jul. 31, 2011 Ferrellgas, L.P. And Subsidiaries [Member]	Jul. 31, 2010 Ferrellgas, L.P. And Subsidiaries [Member]
Senior notes, principal amount								$ 280,000,000	$ 300,000,000									$ 500,000,000				$ 280,000,000
Principal amount of debt, commenced offer to exchange																	500,000,000
Debt instrument, maturity year					2012			2020	2017	2010	2013	2014	2014	2014	2021	2021	2021	2021	2021	2021		2020	2020	2020	2020	2020
Debt redeemed					268,000,000					82,000,000	70,000,000		450,000,000		500,000,000				500,000,000			98,000,000	98,000,000	98,000,000	98,000,000
Prepayment premium for early extinguishment of debt	17,300,000	(46,962,000)	(20,716,000)																		3,400,000						17,300,000	(36,449,000)	(17,308,000)
Make-whole payments											17,300,000	11,100,000	11,100,000	11,100,000								8,400,000		8,400,000	8,400,000
Percentage of senior notes offering price equalizing par value									98.60%
Debt instrument, interest rate					8.75%	6.75%	6.75%	8.625%	9.125%	7.24%	7.42%		6.75%				6.50%	6.50%				8.625%
Accrued interest		$ 19,779,000	$ 20,412,000										$ 2,400,000									$ 2,400,000						$ 17,773,000	$ 17,324,000
Debt instrument earliest redemption date								Jun. 15, 2015