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Condensed Consolidated Statements of Operations (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Condensed Consolidated Statements Of Operations Parenthetical        
Related party purchases (approximate ammounts, in millions) $ 7.0 $ 6.8 $ 17.5 $ 11.7