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Acquisitions (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Apr. 14, 2021
Feb. 23, 2021
Jan. 02, 2021
Business Acquisition [Line Items]          
Cash consideration to acquire businesses, net of cash acquired $ 220,026 $ 197,562      
Goodwill 925,949       $ 782,087
Goodwill, measurement period adjustment (633)        
NUMECA          
Business Acquisition [Line Items]          
Cash acquired       $ 9,600  
Cash consideration to acquire businesses, net of cash acquired 188,600        
Acquired intangibles       72,200  
Goodwill       $ 132,693  
Pointwise          
Business Acquisition [Line Items]          
Cash consideration to acquire businesses, net of cash acquired $ 31,400        
Acquired intangibles     $ 16,700    
Goodwill     $ 16,700