Consolidated Statements Of Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Operating Expense [Member]
Non-cash stock and unit-based compensation	$ 0.8	$ 0.7
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	0.8	0.7
General And Administrative Expense [Member]
Non-cash stock and unit-based compensation	3.6	2.4
General And Administrative Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	$ 3.6	$ 2.4