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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 25, 2022
May 23, 2022
Dec. 27, 2021
Dec. 26, 2021
Business Acquisition [Line Items]        
Goodwill $ 551.8     $ 493.9
Cosmic Advanced Engineering Solutions, Inc.        
Business Acquisition [Line Items]        
Accounts receivable   $ 3.0 $ 3.8  
Unbilled receivables   11.1 4.0  
Inventory   0.5    
Other current assets   0.1 0.1  
Property and equipment   22.8 1.3  
Other assets   0.2    
Intangible assets   15.0 10.0  
Total identifiable net assets acquired   52.7 19.2  
Total identifiable net liabilities assumed   (2.5) (9.6)  
Goodwill   29.1 28.4  
Net assets acquired, excluding cash   $ 79.3 $ 38.0