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Income Taxes - Change in Valuation Allowance (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 26, 2014	Jan. 27, 2013	Jan. 29, 2012
Change in Deferred Tax Asset Valuation Allowance [Abstract]
Beginning balance	$ 8,320	$ 5,617	$ 5,053
Additions	52,931	2,703	564
Releases	0	0	0
Ending balance	$ 61,251	$ 8,320	$ 5,617

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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