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Provision for Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Income Tax Disclosure [Abstract]      
Provisional net income tax expense $ 787    
Provision for income taxes $ 3,861 $ 2,735  
Effective tax rate 26.00% 23.00%  
Statutory tax rate 21.00%   35.00%