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Property and Equipment (Tables)
12 Months Ended
Jul. 31, 2012
Property and Equipment [Abstract]  
Property and equipment
Property and equipment: Property and equipment are depreciated using the straight-line method over their estimated useful lives as follows:

 
Useful lives (in years)
Building and improvements
7-39
Machinery and equipment
5-7
Furniture and fixtures
5-7
Software
3-10