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Goodwill and Intangibles (Narrative) (Details) - USD ($)
 3 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Finite Lived Intangible Assets [Line Items]    
Overall foreign currency translation adjustment $ (20,168,000) $ 287,524,000
CH2M HILL Companies, Ltd.    
Finite Lived Intangible Assets [Line Items]    
Lease intangible liabilities $ 9,600  
Goodwill Adjustment    
Finite Lived Intangible Assets [Line Items]    
Overstatement adjustment of financial statements line item   209,900,000
Accumulated Other Comprehensive Income Adjustment    
Finite Lived Intangible Assets [Line Items]    
Overstatement adjustment of financial statements line item   $ 209,900,000