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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Inventory Disclosure [Abstract]
Materials and Supplies	$ 10,600us-gaap_InventoryRawMaterials	$ 10,722us-gaap_InventoryRawMaterials
Work-in-Progress	765us-gaap_InventoryWorkInProcess	852us-gaap_InventoryWorkInProcess
Finished Goods	7,372us-gaap_InventoryFinishedGoods	6,798us-gaap_InventoryFinishedGoods
Inventory, Gross	18,737us-gaap_InventoryGross	18,372us-gaap_InventoryGross
Inventory Reserve	(3,155)us-gaap_InventoryValuationReserves	(3,194)us-gaap_InventoryValuationReserves
Balance at January 31	$ 15,582us-gaap_InventoryNet	$ 15,178us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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