Debt (Secured Credit Facility Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended								12 Months Ended			12 Months Ended							12 Months Ended																				12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2014 Ferrellgas, L.P. [Member]	Jul. 31, 2013 Ferrellgas, L.P. [Member]	Jul. 31, 2012 Ferrellgas, L.P. [Member]	Jul. 31, 2014 Letter Of Credit [Member]	Jul. 31, 2014 Letter Of Credit [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Secured Credit Facility [Member]	Jul. 31, 2013 Secured Credit Facility [Member]	Jan. 31, 2014 Secured Credit Facility [Member]	Jul. 31, 2014 Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jan. 31, 2014 Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Federal Funds Rate [Member]	Jul. 31, 2013 Federal Funds Rate [Member]	Jul. 31, 2014 Federal Funds Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Federal Funds Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Federal Funds Rate [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Federal Funds Rate [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Eurodollar Rate Loan [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Eurodollar Rate Loan [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Euro Rate [Member] Secured Credit Facility [Member]	Jul. 31, 2013 Euro Rate [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Euro Rate [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Euro Rate [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Bank Of America's Prime Rate [Member]	Jul. 31, 2013 Bank Of America's Prime Rate [Member]	Jul. 31, 2014 Bank Of America's Prime Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Bank Of America's Prime Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 One Month Eurodollar Rate [Member]	Jul. 31, 2013 One Month Eurodollar Rate [Member]	Jul. 31, 2014 One Month Eurodollar Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 One Month Eurodollar Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Three-Month Eurodollar Rate [Member]	Jul. 31, 2013 Three-Month Eurodollar Rate [Member]	Jul. 31, 2014 Three-Month Eurodollar Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Three-Month Eurodollar Rate [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Minimum [Member]	Jul. 31, 2014 Minimum [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Minimum [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Minimum [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Minimum [Member] Euro Rate [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Minimum [Member] Euro Rate [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Maximum [Member]	Jul. 31, 2014 Maximum [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Maximum [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Maximum [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Maximum [Member] Euro Rate [Member] Secured Credit Facility [Member]	Jul. 31, 2014 Maximum [Member] Euro Rate [Member] Secured Credit Facility [Member] Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date									Oct. 01, 2018			Oct. 01, 2018
Secured line of credit facility							$ 200.0	$ 200.0	$ 600.0	$ 400.0	$ 500.0	$ 600.0	$ 400.0	$ 500.0
Debt Instrument, Interest Rate, Increase (Decrease)									0.25%			0.25%
Write off of Deferred Debt Issuance Cost									0.3			0.3
Credit facility interest rate															0.09%	0.09%	0.09%	0.09%									3.25%	3.25%	3.25%	3.25%	0.17%	0.22%	0.17%	0.22%	0.24%	0.28%	0.24%	0.28%
Total borrowings outstanding, line of credit facility									193.3	171.4		193.3	171.4
Amount classified as long-term debt									123.8	121.3		123.8	121.3
Weighted average interest rate of debt									3.40%	3.70%		3.40%	3.70%
Debt instrument, basis spread rate									1.25%	1.75%		1.25%	1.75%						0.50%	0.50%	1.00%	1.00%	2.25%	2.75%	2.25%	2.75%															0.75%	0.75%	1.75%	1.75%			1.75%	1.75%	2.75%	2.75%
Commitment fee payable rate																																							0.35%	0.35%					0.50%	0.50%
Letters of credit outstanding	56.3	53.9		56.3	53.9
Letter of credit facility, remaining capacity	143.7	146.1		143.7	146.1
Line of credit facility, commitment fee	$ 1.2	$ 0.9	$ 0.9	$ 1.2	$ 0.9	$ 0.9