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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
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Deferred tax assets: |  |
Product warranty accruals | $ 10,500 | $ 2,652
Allowance for doubtful accounts | 4,874 | 3,981
Inventory reserves | 7,211 | 7,187
Sales program allowances | 1,289 | 1,185
Reserve for sales returns | 2,196 | 1,732
Accrued vacation | 11,438 | 9,079
Other accruals | 10,587 | 4,320
Share based compensation | 10,201 | 7,501
Tax credit carryforwards | 18,523 | 11,164
Intangible assets | 212,695 | 250,313
Net operating losses | 5,566 | 1,981
Benefit related to uncertain tax positions | 5,239 | 6,095
Operating leases | 15,578 | 12,711
Deferred revenue | 26,199 |
Other | 1,883 | 1,755
Valuation allowance related to loss carryforward and tax credits | (10,853) | (4,562)
Total deferred tax assets | 333,126 | 317,094
Deferred tax liabilities: |  |
Fixed assets | 37,359 | 33,754
Operating leases | 15,343 | 12,473
Prepaid and perpetual license assets | 22,166 |
Other prepaid expenses | 2,564 | 1,849
Capitalized preproduction design and development costs | 8,408 |
Book basis in excess of tax basis for acquired entities | 33,154 | 22,488
Withholding tax | 83,329 | 91,966
Deferred revenue |  | 800
Other | 2,192 |
Total deferred tax liabilities | 204,515 | 163,330
Net deferred tax assets | $ 128,611 | $ 153,764

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