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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
Feb. 28, 2014
May 31, 2013
Inventories      
Raw materials $ 24,799   $ 18,362
Work in process 12,130   11,006
Finished goods 24,127   25,694
Total $ 61,056 $ 59,117 $ 55,062