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Income Taxes Summary of changes in valuation allowance (Details) - USD ($)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Valuation Allowance [Line Items]        
Valuation allowance for deferred tax assets $ 179,599,000 $ 72,602,000 $ 67,451,000 $ 61,358,000
Change in valuation allowance 106,997,000      
Charged to expense        
Valuation Allowance [Line Items]        
Change in valuation allowance 52,135,000 729,000 6,859,000  
Charged to other accounts        
Valuation Allowance [Line Items]        
Change in valuation allowance [1] 20,819,000 $ 4,422,000 $ (766,000)  
Charged to retained earnings upon adoption of ASU 2016-16 [Member]        
Valuation Allowance [Line Items]        
Deferred Tax Assets, Tax Deferred Expense, Other 34,043      
Change in valuation allowance [2] $ 34,043,000      
[1] Charges to other accounts include the effects of foreign currency translation and purchase accounting adjustments.
[2] The Company adopted ASU 2016-16 on December 31, 2017 using the modified retrospective method, however there was no net cumulative-effect adjustment recorded to retained earnings as of that date. Upon adoption, the Company recognized additional net deferred tax assets of $34,043 and a corresponding increase in valuation allowance against these additional deferred tax assets as these deferred tax assets are not considered to be more likely than not realizable.