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Condensed Consolidated Statements Of Earnings (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Operating Expense [Member]
   
Non-cash stock and unit-based compensation $ 0.7 $ 1.2
General And Administrative Expense [Member]
   
Non-cash stock and unit-based compensation 2.4 1.7
Ferrellgas, L.P. [Member] | Operating Expense [Member]
   
Non-cash stock and unit-based compensation 0.7 1.2
Ferrellgas, L.P. [Member] | General And Administrative Expense [Member]
   
Non-cash stock and unit-based compensation $ 2.4 $ 1.7