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Acquisitions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 17, 2018 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Total purchase consideration: |  |  |  |
Cash, net of cash acquired |  | $ 0 | $ 775 | $ 318,474
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |
Goodwill |  | $ 816,812 | $ 820,589 | $ 826,715
IXYS Corporation |  |  |  |
Total purchase consideration: |  |  |  |
Cash, net of cash acquired | $ 302,865 |  |  |
Cash settled stock options | 3,622 |  |  |
Littelfuse stock | 434,192 |  |  |
Converted stock options | 38,109 |  |  |
Total purchase consideration | 778,788 |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |
Current assets, net | 155,930 |  |  |
Property, plant, and equipment | 77,442 |  |  |
Intangible assets | 212,720 |  |  |
Goodwill | 382,360 |  |  |
Other non-current assets | 28,706 |  |  |
Other non-current liabilities | (78,370) |  |  |
Assets acquired and liabilities assumed | $ 778,788 |  |  |

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