Income Taxes Income Before Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 29, 2019	[1]	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
U.S.										$ 29,252	$ 32,627	$ 3,743
Non-U.S.										207,890	225,056	292,975
Income from continuing operations before income taxes	$ 65,296		$ 63,254	$ 71,827	$ 36,765	$ 79,429	$ 78,041	$ 71,708	$ 28,505	$ 237,142	$ 257,683	$ 296,718

[1] The fourth quarter of fiscal year 2019 includes a pre-tax loss of $31.2 million as a result of the mark-to-market adjustment on postretirement benefit plans. The fourth quarter of fiscal year 2018 includes a pre-tax loss of $21.4 million as a result of the mark-to-market adjustment on postretirement benefit plans. See Note 1 for a discussion of this accounting policy