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Assets and liabilities held for sale (Details) - USD ($)
$ in Thousands
Apr. 02, 2016
Jan. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Disposal Group, Including Discontinued Operation, Trade Receivables $ 6,303  
Disposal Group, Including Discontinued Operation, Other Assets, Current 127  
Disposal Group, Including Discontinued Operation, Inventory, Current 12,076  
Disposal Group, Including Discontinued Operation, Other Assets, Current 717  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current 743  
Disposal Group, Including Discontinued Operation, Assets of Disposal Group 19,966  
Disposal Group, Including Discontinued Operation, Accounts Payable, Current 1,579  
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current 300  
Disposal Group, Including Discontinued Operation, Other Liabilities, Current 477  
Disposal Group, Including Discontinued Operation, Deferred Revenue, Current 1,775  
Disposal Group, Including Discontinued Operation, Liabilities, Current 478  
Disposal Group, Including Discontinued Operation, Liabilities $ 4,609 $ 0