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Divestitures (not accounted for as discontinued operations) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 03, 2016
Jul. 03, 2016
Dec. 31, 2017
Jan. 01, 2017
Apr. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from divestitures     $ 0 $ 231  
Fox enterprises Inc          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total impairment charge on long-lived assets included in the disposal group   $ 800      
Proceeds from divestitures $ 1,200        
Loss on disposition of assets         $ 700