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Business Combinations - Narrative (Details) - USD ($)
shares in Millions
 3 Months Ended 9 Months Ended
Dec. 29, 2017
Dec. 15, 2017
Jun. 29, 2018
Jun. 29, 2018
Business Acquisition [Line Items]        
Decrease in intangible assets       $ 3,421,000
Customer relationships, contracts and backlog        
Business Acquisition [Line Items]        
Decrease in intangible assets       (200,000)
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   $ 705,900,000    
Goodwill recognized expected to be deductible for tax purposes   0    
Decrease in intangible assets     $ 186,200,000  
Decrease in property, equipment and improvements     50,500,000  
Decrease in receivables     45,900,000  
Increase in accrued liabilities       $ 60,300,000
Increase in miscellaneous long-term assets     75,800,000  
Goodwill increase in the period     $ 268,300,000  
Business combination assumed pensions and other long-term employee related liabilities included in deferred liabilities   291,000,000    
Revenue contributed by acquiree from acquisition date $ 2,500,000,000      
Net earnings contributed by acquiree from acquisition date 87,900,000      
Pre-tax restructuring and transaction costs $ 93,300,000      
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