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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Inventory Disclosure [Abstract]
Materials and Supplies	$ 10,722	$ 7,419
Work-in-Progress	852	590
Finished Goods	6,798	5,953
Inventory, Gross	18,372	13,962
Inventory Reserve	(3,194)	(2,783)
Balance at January 31	$ 15,178	$ 11,179

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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 before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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