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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

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