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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Inventory [Line Items]    
Raw materials and supplies $ 6,414 $ 6,267
Work-in-progress 6,261 5,296
Finished goods 1,273 3,367
Inventories $ 13,948 $ 14,930