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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
May 31, 2013
Inventory [Line Items]    
Raw Materials $ 20,516 $ 16,587
Work-in-process 3,935 3,583
Finished and purchased goods 22,879 18,145
Inventories $ 47,330 $ 38,315