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Recent Accounting Standards Adopted (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 30, 2017
Sep. 29, 2018
Recent Accounting Standards Adopted    
Increase in cumulative effect adjustment on fiscal 2018 opening balance of retained earnings   $ 366
ASU 2016-09    
Recent Accounting Standards Adopted    
Increase in cumulative effect adjustment on fiscal 2018 opening balance of retained earnings $ 400