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Derivatives and Hedging (Tables)
6 Months Ended
Jan. 31, 2013
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  
  January 31, 2013   $ (3,587 ) $ (2,290 ) $  
  July 31, 2012   $ (4,872 ) $ (3,110 ) $