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Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details)
£ in Millions, shares in Millions, $ in Millions
12 Months Ended
Mar. 06, 2020
GBP (£)
Mar. 06, 2020
USD ($)
Jun. 12, 2019
USD ($)
Apr. 26, 2019
USD ($)
shares
Dec. 15, 2017
USD ($)
shares
Oct. 02, 2020
segment
Business Acquisition [Line Items]            
Number of lines of business | segment           2
Worley Stock            
Business Acquisition [Line Items]            
Equity instrument consideration, shares | shares       58.2    
ECR Business            
Business Acquisition [Line Items]            
Consideration transferred       $ 3,400.0    
Business combination consideration paid in cash       $ 2,800.0    
John Wood Group            
Business Acquisition [Line Items]            
Enterprise value on debt-free, cash-free basis (USD, GBP) £ 246 $ 317.9        
Business combination, cash acquired   24.3        
Business combination assumed revolving credit facility and second lien notes   $ 29.2        
KeyW Holding Corporation            
Business Acquisition [Line Items]            
Business combination, cash acquired     $ 29.1      
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 combinatin, short term debt     $ 298.4      
CH2M HILL Companies, Ltd.            
Business Acquisition [Line Items]            
Business combination, cash acquired         $ 315.2  
Percentage of outstanding shares of common and preferred stock acquired         100.00%  
Business combination consideration paid in cash         $ 1,800.0  
Business combination consideration equity issued         $ 1,400.0  
Business combination consideration equity issued, shares | shares         20.7  
Business combination assumed revolving credit facility and second lien notes         $ 706.0  
Revolving Credit Facility and Second Lien Notes | CH2M HILL Companies, Ltd.            
Business Acquisition [Line Items]            
Business combinatin, short term debt         20.0  
Business combination assumed revolving credit facility and second lien notes         $ 700.0