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Component of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jul. 31, 2012
Inventories [Line Items]    
Raw materials $ 59,062 $ 56,198
Work-in-process 2,022 2,154
Finished goods 21,969 25,638
Inventories, net $ 83,053 $ 83,990