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Derivatives and Hedging (Tables)
12 Months Ended
Jul. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of fair value of derivative
As of     Asset or
(Liability)
   Gain or (loss) in
Comprehensive
Income
   Amount
Reclassified into
Earnings
July 31, 2012
              $ (4,872 )         $ (3,110 )         $    
July 31, 2011
              $           $           $