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Business Combinations - Narrative (Details)
£ in Millions, shares in Millions
 3 Months Ended 4 Months Ended 12 Months Ended 21 Months Ended
Aug. 20, 2019
USD ($)
Aug. 20, 2019
GBP (£)
Jun. 12, 2019
USD ($)
Dec. 15, 2017
USD ($)
shares
Sep. 27, 2019
USD ($)
Dec. 28, 2018
USD ($)
Sep. 27, 2019
USD ($)
Sep. 27, 2019
USD ($)
Sep. 28, 2019
USD ($)
Business Acquisition [Line Items]                  
Goodwill recognized expected to be deductible for tax purposes     $ 136,000,000.0            
KeyW Holding Corporation                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares of common and preferred stock acquired     100.00%            
Business combination consideration paid in cash     $ 604,200,000            
Business combination, cash acquired     29,100,000            
Short term debt     22,600,000            
Business combination assumed revolving credit facility and second lien notes     275,800,000            
Adjustments to accrued liabilities and other deferred liabilities         $ 7,500,000        
Decrease in intangible assets         9,300,000        
Increase in other assets excluding goodwill         7,400,000        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill         9,400,000        
Revenue contributed by acquiree from acquisition date             $ 136,300,000    
Net earnings contributed by acquiree from acquisition date             17,700,000    
Consideration transferred     902,600,000            
Business acquisition, transaction costs         12,900,000   $ 12,900,000 $ 12,900,000  
Short term debt     $ 298,400,000            
KeyW Holding Corporation | Customer Relationships                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               10 years  
KeyW Holding Corporation | Developed Technology                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               12 years  
KeyW Holding Corporation | Noncompete Agreements                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               9 years  
KeyW Holding Corporation | Contract and backlog intangible                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               10 years  
CH2M HILL Companies, Ltd.                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares of common and preferred stock acquired       100.00%          
Business combination consideration paid in cash       $ 1,800,000,000          
Business combination, cash acquired       315,200,000          
Business combination consideration equity issued       $ 1,400,000,000          
Business combination consideration equity issued, shares | shares       20.7          
Business combination assumed revolving credit facility and second lien notes       $ 706,000,000.0          
Goodwill recognized expected to be deductible for tax purposes       0          
Adjustments to accrued liabilities and other deferred liabilities       404,700,000          
Decrease in receivables           $ (4,000,000.0)      
Increase in accrued liabilities         51,800,000 11,500,000      
Increase in long-term assets           $ 20,700,000      
Decrease in miscellaneous long-term assets         $ (12,800,000)        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill               $ 36,400,000  
Revenue contributed by acquiree from acquisition date                 $ 3,800,000,000
Net earnings contributed by acquiree from acquisition date                 185,900,000
Pre-tax restructuring and transaction costs                 $ 99,300,000
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               10 years  
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Minimum                  
Business Acquisition [Line Items]                  
Finite-lived intangible asset, useful life               9 years  
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Maximum                  
Business Acquisition [Line Items]                  
Finite-lived intangible asset, useful life               11 years  
CH2M HILL Companies, Ltd. | Other Intangible Assets and Liabilities                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life               10 years  
CH2M HILL Companies, Ltd. | Revolving Credit Facility and Second Lien Notes                  
Business Acquisition [Line Items]                  
Short term debt       20,000,000.0          
Business combination assumed revolving credit facility and second lien notes       $ 700,000,000          
John Wood Group's Nuclear Consulting                  
Business Acquisition [Line Items]                  
Consideration transferred $ 300,000,000 £ 250