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Income Taxes - Reconciliation of federal statutory income tax rate to effective income tax rate for continuing operations (Details)
3 Months Ended 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Jan. 04, 2020
Dec. 29, 2018
Dec. 30, 2017
Federal statutory income tax rate to effective income tax rate for continuing operations          
U.S. federal statutory income tax rate (as a percent) 21.00% 35.00% 21.00% 21.00% 35.00%
Increase (decrease) resulting from:          
Research and development tax credits (as a percent)     (7.60%) (2.90%) (2.60%)
U.S. amended returns tax rate differential     (1.20%)    
State income taxes (net of federal impact) (as a percent)     0.30% (0.10%) (1.90%)
Non-U.S. tax rate differential and foreign tax credits (as a percent)     1.40% 1.30% (2.90%)
U.S. tax reform enactment impact (as a percent)       (1.00%) 34.90%
Domestic manufacturing deduction (as a percent)         (1.10%)
Gain on business disposition, primarily in non-U.S. jurisdictions (as a percent)       (5.00%)  
Other, net (as a percent)     (0.40%) (1.60%) (1.60%)
Effective income tax rate (as a percent)     13.50% 11.70% 59.80%