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Business Combinations - Narrative (Details) - USD ($)
shares in Millions
 12 Months Ended
Dec. 29, 2017
Dec. 15, 2017
Sep. 28, 2018
Sep. 29, 2017
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    
Goodwill recognized expected to be deductible for tax purposes   0    
Adjustments to accrued liabilities and other deferred liabilities   385,300,000    
Decrease in intangible assets     $ 186,200,000  
Decrease in property, plant and equipment     50,500,000  
Decrease in receivables     77,300,000  
Increase in accrued liabilities     364,400,000  
Increase in long-term assets     245,500,000  
Goodwill     $ 430,300,000  
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]        
Business combination prepayment penalty   20,000,000    
Business combination assumed revolving credit facility and second lien notes   $ 700,000,000    
Aquenta Consulting Pty Ltd And Blue Canopy LLC        
Business Acquisition [Line Items]        
Goodwill       $ 119,300,000