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Business Combinations - Narrative (Details) - USD ($)
shares in Millions
 9 Months Ended 12 Months Ended
Mar. 06, 2020
Jun. 12, 2019
Dec. 15, 2017
Sep. 28, 2018
Oct. 02, 2020
Contracts And Backlog Intangible          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life   10 years      
Other Intangible Assets          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life   9 years      
Developed Technology          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life   12 years      
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   298,400,000      
Goodwill recognized expected to be deductible for tax purposes   136,300,000      
Consideration transferred   902,600,000      
Short term debt   $ 298,400,000      
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     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    
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          
Business Acquisition [Line Items]          
Business combination, enterprise value $ 246,000,000        
Business combinations, less cash 317,900,000        
Business combination, cash acquired 24,300,000        
Business combination assumed revolving credit facility and second lien notes $ 29,200,000        
John Wood Group | Contracts And Backlog Intangible          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life 12 years        
John Wood Group | Developed Technology          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life 15 years