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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses and reserves | $ 31,123 | $ 28,294
Domestic and non-U.S. net operating loss carryforwards | 24,763 | 10,511
Non-U.S. interest expense carryforwards | 10,352 | 5,324
U.S. research credit carryforwards | 3,724 | 2,581
Capitalized expenses | 4,178 | 2,400
U.S. foreign tax credit carryforwards | 772 | 1,320
Other | 117 | 1,261
Gross deferred tax assets | 75,029 | 51,691
Less: Valuation allowance | (13,131) | (5,957)
Total deferred tax assets | 61,898 | 45,734
Deferred tax liabilities: |  |
Excess of book basis over the tax basis for intangible assets and goodwill | 76,472 | 71,229
Tax on unremitted earnings | 14,223 | 12,968
Unrealized foreign currency exchange gains | 5,719 | 0
Excess of book basis over the tax basis for property, plant, and equipment | 4,394 | 3,231
Total deferred tax liabilities | 100,808 | 87,428
Net deferred tax liabilities | $ 38,910 | $ 41,694

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