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Intangibles, Net (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
Amortization expenses $ 4.5 $ 4.7 $ 3.9