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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Inventory [Line Items]    
Raw materials $ 16,468us-gaap_InventoryRawMaterialsNetOfReserves $ 14,379us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 1,882us-gaap_InventoryWorkInProcessNetOfReserves 1,670us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 21,145us-gaap_InventoryFinishedGoodsNetOfReserves 21,043us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net, Total $ 39,495us-gaap_InventoryNet $ 37,092us-gaap_InventoryNet [1]
[1] Restated for discontinued operations.