Consolidated Statements Of Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Operating Expense [Member]
Non-cash stock and unit-based compensation	$ 5.3	$ 2.4	$ 2.7
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	5.3	2.4	2.7
General And Administrative Expense [Member]
Non-cash stock and unit-based compensation	19.2	11.2	6.1
General And Administrative Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	$ 19.2	$ 11.2	$ 6.1