Consolidated Statements Of Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Operating Expense [Member]
Non-cash stock and unit-based compensation	$ 3.5	$ 0.8
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	3.5	0.8
General And Administrative Expense [Member]
Non-cash stock and unit-based compensation	12.6	3.6
General And Administrative Expense [Member] | Ferrellgas, L.P. [Member]
Non-cash stock and unit-based compensation	$ 12.6	$ 3.6