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Segments and Geographic Information - Operating Results By Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 25, 2021
USD ($)
segment
Dec. 26, 2020
USD ($)
Dec. 28, 2019
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Revenues $ 769,674 $ 693,616 $ 589,464
Gross profit $ 322,767 $ 287,920 $ 237,496
Gross margin 41.90% 41.50% 40.30%
Probe Cards      
Segment Reporting Information [Line Items]      
Revenues $ 633,281 $ 581,739 $ 491,363
Systems      
Segment Reporting Information [Line Items]      
Revenues 136,393 111,877 98,101
Operating Segments | Probe Cards      
Segment Reporting Information [Line Items]      
Revenues 633,281 581,739 491,363
Gross profit $ 279,873 $ 263,215 $ 211,382
Gross margin 44.20% 45.20% 43.00%
Operating Segments | Systems      
Segment Reporting Information [Line Items]      
Revenues $ 136,393 $ 111,877 $ 98,101
Gross profit $ 65,834 $ 51,835 50,927
Gross margin 48.30% 46.30%  
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues $ 0 $ 0 0
Gross profit $ (22,940) $ (27,130) $ (24,813)
Gross margin 0.00% 0.00% 0.00%