Income Taxes - Reconciliation of federal statutory income tax rate to effective income tax rate for continuing operations (Details)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Federal statutory income tax rate to effective income tax rate for continuing operations
U.S. federal statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
U.S. tax reform impact (as a percent)	34.90%
Federal tax settlement of 1998 to 2008 (as a percent)		(23.50%)
State income taxes (net of federal impact) (as a percent)	(1.90%)	0.80%	0.20%
Non-U.S. tax rate differential and foreign tax credits (as a percent)	(2.90%)	(2.70%)	(3.60%)
Domestic manufacturing deduction (as a percent)	(1.10%)	(1.60%)	(2.70%)
Research credit (as a percent)	(2.60%)	(3.20%)	(1.50%)
Other, net (as a percent)	(1.60%)	(1.00%)	0.70%
Effective income tax rate (as a percent)	59.80%	3.80%	28.10%
Non-U.S.
Increase (decrease) resulting from:
Change in valuation allowance (as a percent)			(1.40%)