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Inventories - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Inventory Disclosure [Abstract]
Work-in-progress	$ 18,165	$ 13,805
Finished goods	7,638	7,888
Total	$ 25,803us-gaap_InventoryNet	$ 21,693us-gaap_InventoryNet

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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