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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Oct. 19, 2020 | Jul. 30, 2020 | Oct. 09, 2019 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 212,761 | $ 199,196 | $ 189,214 | $ 189,920
High Precision Devices, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | $ 1,680 |  |  |  |  |  |
Accounts receivable | 1,017 |  |  |  |  |  |
Inventory | 3,047 |  |  |  |  |  |
Property, plant and equipment | 669 |  |  |  |  |  |
Operating lease, right-of-use-assets | 2,554 |  |  |  |  |  |
Prepaid expenses and other assets | 599 |  |  |  |  |  |
Tangible assets acquired | 9,566 |  |  |  |  |  |
Deferred revenue | (2,393) |  |  |  |  |  |
Accounts payable and accrued liabilities | (1,268) |  |  |  |  |  |
Operating lease liabilities | (2,554) |  |  |  |  |  |
Deferred tax liabilities | (3,465) |  |  |  |  |  |
Total net tangible assets acquired and liabilities assumed | (114) |  |  |  |  |  |
Intangible assets | 14,020 |  | $ 14,020 |  |  |  |
Goodwill | 4,654 |  |  |  |  |  |
Net assets acquired | 18,560 |  |  |  |  |  |
Total acquisition consideration | $ 16,900 |  |  |  |  |  |
Baldwin Park |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | $ 4,365 |  |  |  |  |
Inventory |  | 2,579 |  |  |  |  |
Property, plant and equipment |  | 9,053 |  |  |  |  |
Operating lease, right-of-use-assets |  | 519 |  |  |  |  |
Prepaid expenses and other assets |  | 56 |  |  |  |  |
Tangible assets acquired |  | 16,572 |  |  |  |  |
Accounts payable and accrued liabilities |  | (743) |  |  |  |  |
Operating lease liabilities |  | (519) |  |  |  |  |
Total net tangible assets acquired and liabilities assumed |  | 15,310 |  |  |  |  |
Intangible assets |  | 14,100 |  |  |  |  |
Goodwill |  | 5,590 |  |  |  |  |
Total acquisition consideration |  | $ 35,000 |  |  |  |  |
FRT |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 1,687 |  |  |  |
Accounts receivable |  |  | 3,079 |  |  |  |
Inventory |  |  | 2,643 |  |  |  |
Property, plant and equipment |  |  | 696 |  |  |  |
Operating lease, right-of-use-assets |  |  | 335 |  |  |  |
Prepaid expenses and other assets |  |  | 838 |  |  |  |
Tangible assets acquired |  |  | 9,278 |  |  |  |
Deferred revenue |  |  | (1,933) |  |  |  |
Accounts payable and accrued liabilities |  |  | (1,182) |  |  |  |
Operating lease liabilities |  |  | (335) |  |  |  |
Deferred tax liabilities |  |  | (5,757) |  |  |  |
Total net tangible assets acquired and liabilities assumed |  |  | 71 |  |  |  |
Intangible assets |  |  | 17,429 |  |  |  |
Goodwill |  |  | 11,123 |  |  |  |
Net assets acquired |  |  | 28,623 |  |  |  |
Total acquisition consideration |  |  | $ 26,900 |  |  |  |

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