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Derivatives and Hedging (Tables)
6 Months Ended
Jan. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of Derivative

 

As of     Asset or (Liability)     Gain or (loss) in Comprehensive Income     Amount Reclassified into Earnings
July 31, 2011 $ $ $
January 31, 2012 $ (3,757 ) $ (3,073 ) $