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Significant Accounting Policies - Deferred Revenue (Details) (USD $) In Thousands, unless otherwise specified	Jan. 27, 2013	Jan. 29, 2012
Deferred Revenue [Abstract]
Deferred revenues	$ 4,467	$ 4,964
Deferred cost of revenues	1,099	1,243
Deferred revenue, net	3,368	3,721
Deferred product design and engineering recoveries	377	132
Total deferred revenue	$ 3,745	$ 3,853

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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