Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Accrued expenses and reserves	$ 28,294	$ 34,113
Domestic and non-U.S. net operating loss carryforwards	10,511	8,613
Non-U.S. interest expense carryforwards	5,324	885
U.S. research credit carryforwards	2,581	1,245
Capitalized expenses	2,400	0
U.S. foreign tax credit carryforwards	1,320	1,506
Other	1,261	1,000
Gross deferred tax assets	51,691	47,362
Less: Valuation allowance	(5,957)	(4,794)
Total deferred tax assets	45,734	42,568
Deferred tax liabilities:
Excess of book basis over the tax basis of assets	74,460	74,410
Tax on unremitted earnings	12,968	12,681
Total deferred tax liabilities	87,428	87,091
Net deferred tax liabilities	$ 41,694	$ 44,523