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Summary of Significant Accounting Policies Inventory valuation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Deductions   $ 2,090 $ 601
Inventory Valuation Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Deductions [1] $ 1,753 $ 1,074 $ 2,899
[1] Deductions related to inventory reserve accounts represent amounts written off against the reserve.