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Joint Ventures and VIE's and Other Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Jan. 01, 2021
Oct. 01, 2021
Mar. 02, 2021
Variable Interest Entity [Line Items]        
Consolidated assets $ 14,804,094   $ 14,632,609  
Amount by which equity method investments exceeded share of venture net assets 36,600      
Income from equity method investments (12,749) $ (1,159)    
Impairment of long-lived assets and equity method investment 72,266 27,902    
PA Consulting Employees        
Variable Interest Entity [Line Items]        
Ownership interest of employees       35.00%
PA Consulting Group Limited        
Variable Interest Entity [Line Items]        
Percentage of outstanding shares of common and preferred stock acquired       65.00%
AWE Management Ltd        
Variable Interest Entity [Line Items]        
Percentage of ownership interest in joint venture     24.50%  
Impairment of long-lived assets and equity method investment   27,900    
C3        
Variable Interest Entity [Line Items]        
Gain on sale of stock   82,600    
Consolidated Joint Venture | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Consolidated assets 266,800   $ 289,800  
Consolidated liabilities 208,700   220,800  
Unconsolidated Joint Venture | VIE, not primary beneficiary        
Variable Interest Entity [Line Items]        
Consolidated assets 114,200   115,100  
Consolidated liabilities 127,500   129,500  
Equity method investments 106,700   121,300  
Income from equity method investments 6,800 $ 18,300    
Accounts receivable from unconsolidated joint ventures accounted for under the equity method $ 16,100   $ 19,700