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Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
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Payables and Accruals [Abstract] |  |
Employee-related liabilities | $ 50,689 | $ 40,774
Operating lease liability | 6,811 | 7,259
Interest | 4,517 | 5,058
Restructuring liability | 4,195 | 2,679
Other customer reserves | 3,858 | 1,143
Professional services | 3,321 | 3,986
Deferred revenue | 2,959 | 828
Current benefit liability | 2,751 | 1,106
Other non-income taxes | 2,126 | 1,940
Other | 29,251 | 19,347
Accrued liabilities | $ 110,478 | $ 84,120

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