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GOODWILL (GOODWILL ROLLFORWARD) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 01, 2024
Sep. 30, 2025
Goodwill [Line Items]    
Beginning balance, goodwill   $ 571,197
Goodwill, Foreign Currency Translation Gain (Loss)   2,593
Ending balance, goodwill   573,790
TTEC Digital    
Goodwill [Line Items]    
Beginning balance, goodwill   498,213
Goodwill, Foreign Currency Translation Gain (Loss)   2,087
Ending balance, goodwill   500,300
TTEC Engage    
Goodwill [Line Items]    
Beginning balance, goodwill   72,984
Goodwill, Other Increase (Decrease) $ (103,000)  
Goodwill, Foreign Currency Translation Gain (Loss)   506
Ending balance, goodwill $ 73,000 $ 73,490