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Inventories - Summary of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2015	Jan. 26, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 1,624	$ 1,971
Work in progress	36,759	45,508
Finished goods	35,285	12,788
Inventories	$ 73,668us-gaap_InventoryNet	$ 60,267us-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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