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Subsequent Events - (Narrative) (Details) - USD ($)
Aug. 01, 2017
Jun. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]      
Common stock shares, issued   120,267,039 120,950,899
Common stock, par value   $ 1 $ 1
Subsequent Event | Revolving Credit Facility      
Subsequent Event [Line Items]      
Credit facility, maximum borrowing capacity $ 2,400,000,000    
Subsequent Event | 3-year Term Debt      
Subsequent Event [Line Items]      
Credit facility, maximum borrowing capacity 1,200,000,000    
Subsequent Event | Three-year Senior Unsecured Delayed-draw Term Loan Facility | BNP Paribas, BNP Paribas Securities Corp. and The Bank of Nova Scotia      
Subsequent Event [Line Items]      
Direct borrowings on credit facility 1,200,000,000    
Subsequent Event | CH2M HILL Companies, Ltd.      
Subsequent Event [Line Items]      
Cash consideration paid $ 52,850,000    
Common stock shares, issued 0.6677    
Common stock, par value $ 1.00    
Subsequent Event | Basketball Merger Sub Inc.      
Subsequent Event [Line Items]      
Cash consideration paid $ 88,080,000    
Common stock shares, issued 1.6693