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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
May 31, 2013
Inventory [Line Items]    
Raw Materials $ 18,581 $ 16,587
Work-in-process 3,806 3,583
Finished and purchased goods 21,370 18,145
Inventories $ 43,757 $ 38,315