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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Dec. 26, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 235,142 | $ 239,542
Accumulated Amortization | 195,947 | 180,395
Net | 39,195 | 59,147
Developed technologies |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 173,160 | 176,265
Accumulated Amortization | 148,518 | 137,754
Net | 24,642 | 38,511
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 51,514 | 52,488
Accumulated Amortization | 37,885 | 33,378
Net | 13,629 | 19,110
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 8,110 | 8,162
Accumulated Amortization | 7,586 | 7,363
Net | 524 | 799
Order backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,958 | 2,227
Accumulated Amortization | 1,958 | 1,900
Net | 0 | 327
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 400 | 400
Accumulated Amortization | 0 | 0
Net | $ 400 | $ 400

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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