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Consolidated Statements Of Earnings (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Operating Expense [Member]
     
Non-cash stock and unit-based compensation $ 2.7 $ 3.8 $ 2.2
General And Administrative Expense [Member]
     
Non-cash stock and unit-based compensation 6.1 9.7 5.7
Ferrellgas, L.P. [Member] | Operating Expense [Member]
     
Non-cash stock and unit-based compensation 2.7 3.8 2.2
Ferrellgas, L.P. [Member] | General And Administrative Expense [Member]
     
Non-cash stock and unit-based compensation $ 6.1 $ 9.7 $ 5.7