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Business Combinations - Narrative (Details)
$ / shares in Units, £ in Millions, $ in Millions
3 Months Ended
Aug. 20, 2019
USD ($)
Aug. 20, 2019
GBP (£)
Jun. 12, 2019
USD ($)
Dec. 27, 2019
$ / shares
Dec. 28, 2018
USD ($)
Sep. 27, 2019
$ / shares
Business Acquisition [Line Items]            
Common stock, par value (in dollars per share) | $ / shares       $ 1   $ 1
Acquired finite-lived intangible assets, weighted average useful life       9 years    
Developed Technology Rights            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life       12 years    
Customer Relationships Contracts and Backlog            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life       10 years    
KeyW Holding Corporation            
Business Acquisition [Line Items]            
Percentage of outstanding shares of common and preferred stock acquired     100.00%      
Consideration transferred     $ 902.6      
Business combination consideration paid in cash     604.2      
Business combination, consideration, debt assumed     382.2      
Business combination, cash acquired     29.1      
Business combination prepayment penalty     298.4      
Business acquisitions pro forma income tax expense (benefit)         $ 23.3  
Goodwill recognized expected to be deductible for tax purposes     136.0      
Short term debt     $ 298.4      
John Wood Group's Nuclear Business            
Business Acquisition [Line Items]            
Consideration transferred $ 300.0 £ 250.0