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Goodwill and Intangible Assets - Change in carrying amount of goodwill (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Apr. 30, 2013
Goodwill [Roll Forward]  
Balance as of July 31, 2012 $ 196,438
Goodwill recorded during the period 13,456
Effect of foreign currency exchange rates (1,314)
Balance as of April 30, 2013 $ 208,580