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Business Combinations - Narrative (Details) - USD ($)
shares in Millions
 3 Months Ended 15 Months Ended
Dec. 29, 2017
Dec. 15, 2017
Dec. 28, 2018
Dec. 28, 2018
Business Acquisition [Line Items]        
Decrease in intangible assets     $ (100,000)  
Customer relationships, contracts and backlog        
Business Acquisition [Line Items]        
Decrease in intangible assets     $ 0  
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    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities   404,700,000    
Decrease in intangible assets       $ 186,200,000
Decrease in property, equipment and improvements       50,500,000
Decrease in receivables       81,300,000
Increase in accrued liabilities       352,900,000
Increase in miscellaneous long-term assets       266,200,000
Goodwill increase in the period       $ 402,200,000
Revenue of acquiree since acquisition date, actual $ 131,000,000      
Earnings of acquiree since acquisition date, actual 15,700,000      
Restructuring and transaction costs $ 30,000,000      
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