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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Inventory [Line Items]    
Raw materials and supplies $ 7,417us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 6,414us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work-in-progress 6,466us-gaap_InventoryWorkInProcessNetOfReserves 6,261us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 2,891us-gaap_InventoryFinishedGoodsNetOfReserves 1,273us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 16,774us-gaap_InventoryNet $ 13,948us-gaap_InventoryNet