Consolidated Statements Of Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Operating Expense [Member]
Non-cash stock and unit-based compensation	$ 2.4	$ 2.7	$ 3.8
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	2.4	2.7	3.8
General And Administrative Expense [Member]
Non-cash stock and unit-based compensation	11.2	6.1	9.7
General And Administrative Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	$ 11.2	$ 6.1	$ 9.7