Net Earnings (Loss) Per Common Unitholders' Interest (Basic And Diluted Net Earnings Per Common Unitholders' Interest) (Details) (USD $) In Thousands, except Share data	3 Months Ended												12 Months Ended
	Jul. 31, 2011	Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010		Jan. 31, 2010	Oct. 31, 2009		Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Net Earnings (Loss) Per Common Unitholders' Interest
Common unitholders' interest in net earnings (loss)	$ (40,498)	$ 3,141	[1]	$ 21,908	[2]	$ (27,763)	$ (40,095)	$ 28,574	[3]	$ 64,397	$ (32,338)	[4]	$ (43,212)	$ 32,382	$ 52,046
Weighted average common units outstanding													72,313,600	69,241,700	65,540,700
Dilutive securities														131,800	72,700
Weighted average common units outstanding plus dilutive securities	72,313,600						69,373,500						72,313,600	69,373,500	65,613,400
Basic and diluted net earnings (loss) per common unitholders' interest	$ (0.53)	$ 0.04	[1]	$ 0.31	[2]	$ (0.40)	$ (0.58)	$ 0.41	[3]	$ 0.93	$ (0.47)	[4]	$ (0.60)	$ 0.47	$ 0.79

[1] Includes litigation accrual and related legal fees, which decreased Net earnings by $10.5 million, decreased Net earnings attributable to Ferrellgas Partners, L.P. by $10.4 million, decreased Common unitholders' interest in net earnings by $10.3 million and decreased Basic and diluted net earnings per common unitholders' interest by $0.14. Also includes "Loss on extinguishment of debt," which decreased Net earnings by $10.5 million, decreased Net earnings attributable to Ferrellgas Partners, L.P. by $10.5 million, decreased Common unitholders' interest in net earnings by $10.4 million and decreased Basic and diluted net earnings per common unitholders' interest by $0.14. See Note L - Contingencies and commitments - for a discussion of the litigation accrual and related legal fees. See Note H - Debt - for a discussion of make-whole payments and non-cash write-offs of debt.

[2] Includes "Loss on extinguishment of debt," which decreased Net earnings by $36.4 million, decreased Net earnings attributable to Ferrellgas Partners, L.P. by $36.1 million, decreased Common unitholders' interest in net earnings by $35.7 million and decreased Basic and diluted net earnings per common unitholders' interest by $0.50. See Note H - Debt - for a discussion of make-whole payments and non-cash write-offs of debt.

[3] Includes "Loss on extinguishment of debt," which decreased Net earnings by $3.4 million, decreased Net earnings attributable to Ferrellgas Partners, L.P. by $3.4 million, decreased Common unitholders' interest in net earnings by $3.4 million and decreased Basic and diluted net earnings per common unitholders' interest by $0.05.

[4] Includes "Loss on extinguishment of debt" which increased Net loss by $17.3 million, increased Net loss attributable to Ferrellgas Partners, L.P. by $17.1 million, increased Common unitholders' interest in net loss by $17.0 million and increased Basic and diluted net loss per common unitholders' interest by $0.25.