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Business Combinations (Narrative) (Details) - CH2M HILL Companies, Ltd. - USD ($)
shares in Millions
3 Months Ended
Dec. 29, 2017
Dec. 15, 2017
Dec. 29, 2017
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 consideridation equity issued   $ 1,400,000,000  
Business combination consideridation equity issued, shares   20.7  
Business combination assumed revolving credit facility and second lien notes   $ 702,300,000  
Business combination assumed pensions and other long-term employee related liabilities included in deferred liabilities   291,000,000  
Goodwill recognized expected to be deductible for tax purposes   0  
Revenue contributed by acquiree from acquisition date $ 131,000,000    
Net loss from operations contributed by acquiree from acquisition date 15,700,000    
Pre-tax restructuring and transaction costs $ 30,000,000    
Customer Relationships, Contracts and Backlog      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life     8 years
Customer Relationships, Contracts and Backlog | Minimum      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life     5 years
Customer Relationships, Contracts and Backlog | Maximum      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life     13 years
Trade Name      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life     3 years
Other Intangible Assets and Liabilities      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life     12 years
Revolving Credit Facility and Second Lien Notes      
Business Acquisition [Line Items]      
Business combination assumed revolving credit facility and second lien notes   700,000,000  
Business combination prepayment penalty   $ 20,000,000