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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. 28, 2018
Dec. 29, 2017
Segment Reporting Information [Line Items]    
Revenues $ 3,083,788 $ 1,783,999
Total Segment Operating Profit 113,130 (4,670)
Restructuring and Other Charges from Continuing Operations (47,234) (15,727)
Total Other (Expense) Income, net (20,939) (2,033)
Earnings from Continuing Operations Before Taxes 92,191 (6,703)
Restructuring charges excluded segment profit 39,401  
CH2M HILL Companies, Ltd.    
Segment Reporting Information [Line Items]    
Transaction Costs 0 (67,641)
Restructuring charges excluded segment profit 39,401 19,349
CH2M HILL Companies, Ltd. | Other Expense    
Segment Reporting Information [Line Items]    
Litigation expenses included in segment profit 2,200  
Amortization of deferred financing fees 500 300
Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 231,611 127,927
Corporate    
Segment Reporting Information [Line Items]    
Other Corporate Expenses (71,247) (49,229)
Aerospace, Technology and Nuclear | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,035,028 710,875
Total Segment Operating Profit 72,152 61,066
Litigation expenses included in segment profit 15,000  
Buildings, Infrastructure and Advanced Facilities | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 2,048,760 1,073,124
Total Segment Operating Profit 159,459 $ 66,861
Restructuring charges excluded segment profit $ 22,600