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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
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