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Inventories (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016	Apr. 30, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 21,984	$ 10,233	$ 14,917
WIP	21,086	13,443	17,776
Raw materials	10,854	10,927	9,557
Inventories, net	$ 53,924	$ 34,603	$ 42,250

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.6(a)(1))
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-Publisher SEC
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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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