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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Inventories    
Raw materials $ 24,734us-gaap_InventoryRawMaterials $ 18,362us-gaap_InventoryRawMaterials
Work in process 11,992us-gaap_InventoryWorkInProcess 11,006us-gaap_InventoryWorkInProcess
Finished goods 24,508us-gaap_InventoryFinishedGoods 25,711us-gaap_InventoryFinishedGoods
Total $ 61,234us-gaap_InventoryNet $ 55,079us-gaap_InventoryNet