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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Segment Reporting Information [Line Items]    
Revenues from External Customers $ 2,750,311 $ 2,551,604
Total Segment Operating Profit 47,644 88,628
Restructuring and Other Charges (19,349) (31,741)
Total Other Expense (5,728) (2,748)
Earnings Before Taxes 41,916 85,880
CH2M HILL Companies, Ltd.    
Segment Reporting Information [Line Items]    
CH2M Transaction Costs (67,641)  
Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 176,763 138,665
Corporate Non-Segment    
Segment Reporting Information [Line Items]    
Other Corporate Items (42,129) (18,296)
Petroleum & Chemicals    
Segment Reporting Information [Line Items]    
Revenues from External Customers 620,957 641,813
Petroleum & Chemicals | Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 27,557 23,652
Aerospace & Technology    
Segment Reporting Information [Line Items]    
Revenues from External Customers 721,567 577,436
Aerospace & Technology | Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 65,820 51,087
Buildings & Infrastructure    
Segment Reporting Information [Line Items]    
Revenues from External Customers 658,466 580,617
Buildings & Infrastructure | Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 45,273 38,797
Industrial    
Segment Reporting Information [Line Items]    
Revenues from External Customers 749,321 751,738
Industrial | Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit $ 38,113 $ 25,129