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Basis of Presentation and General Information (Carrying Amount And Activity Of Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Carrying amount and activity of goodwill    
Goodwill, Beginning Balance $ 84,207 $ 85,074
Foreign currency translation adjustment 371 (867)
Goodwill, Ending Balance 84,578 84,207
The Hackett Group [Member]    
Carrying amount and activity of goodwill    
Goodwill, Beginning Balance 43,535 44,402
Foreign currency translation adjustment 371 (867)
Goodwill, Ending Balance 43,906 43,535
Hackett Technology Solutions [Member]    
Carrying amount and activity of goodwill    
Goodwill, Beginning Balance 40,672 40,672
Goodwill, Ending Balance $ 40,672 $ 40,672