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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Goodwill [Roll Forward]    
Balance $ 198,620 $ 175,870
Goodwill recorded during the period 1,420 19,309
Effect of foreign currency translation (3,602) 3,441
Balance $ 196,438 $ 198,620