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Inventories (Tables)
3 Months Ended
Oct. 31, 2012
Inventories [Abstract]  
Components Of Inventory
    October 31,     July 31,  
    2012     2012  
Materials   $ 108,450     $ 111,808  
Work in process     34,550       30,767  
Finished products     129,396       113,541  
Total inventories   $ 272,396     $ 256,116