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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. 27, 2019
Dec. 28, 2018
Segment Reporting Information [Line Items]    
Revenues $ 3,360,049 $ 3,083,788
Total Segment Operating Profit 151,345 113,130
Restructuring and Other Charges (49,663) (47,234)
Total Other (Expense) Income, net 102,824 (20,939)
Earnings from Continuing Operations Before Taxes 254,169 92,191
Other expense   6,400
Revenue from Related Parties 12,000 99,100
Interest expense 14,817 25,325
CH2M HILL Companies, Ltd.    
Segment Reporting Information [Line Items]    
Transaction Costs (1,023) 0
CH2M HILL Companies, Ltd. | Other Expense    
Segment Reporting Information [Line Items]    
Amortization of deferred financing fees   500
Interest expense   25,300
Operating Segments    
Segment Reporting Information [Line Items]    
Total Segment Operating Profit 268,750 231,611
Corporate    
Segment Reporting Information [Line Items]    
Other expenses (66,719) (71,247)
Corporate | CH2M HILL Companies, Ltd. | Other Expense    
Segment Reporting Information [Line Items]    
Amortization of deferred financing fees 600  
Gain (loss) related to settlement 2,200  
Corporate | CH2M HILL Companies, Ltd. | Other Expense | Pension Plan    
Segment Reporting Information [Line Items]    
Gain (loss) related to settlement 2,400  
Aerospace, Technology and Nuclear | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,182,457 1,035,028
Total Segment Operating Profit 90,422 72,152
Buildings, Infrastructure and Advanced Facilities | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 2,177,592 2,048,760
Total Segment Operating Profit 178,328 159,459
ECR Business | Corporate | Other Expense    
Segment Reporting Information [Line Items]    
Amortization of Intangible Assets $ (21,800) $ (18,700)