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Segments and Geographic Information - Operating Results By Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 30, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 25, 2021
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Revenues $ 663,102 $ 747,937 $ 769,674
Gross profit $ 258,580 $ 296,009 $ 322,767
Gross margin 39.00% 39.60% 41.90%
Probe Cards      
Segment Reporting Information [Line Items]      
Revenues $ 497,903 $ 591,422 $ 633,281
Systems      
Segment Reporting Information [Line Items]      
Revenues 165,199 156,515 136,393
Operating Segments | Probe Cards      
Segment Reporting Information [Line Items]      
Revenues 497,903 591,422 633,281
Gross profit $ 185,392 $ 235,562 $ 279,873
Gross margin 37.20% 39.80% 44.20%
Operating Segments | Systems      
Segment Reporting Information [Line Items]      
Revenues $ 165,199 $ 156,515 $ 136,393
Gross profit $ 84,735 $ 80,937 $ 65,834
Gross margin 51.30% 51.70% 48.30%
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues $ 0 $ 0 $ 0
Gross profit $ (11,547) $ (20,490) $ (22,940)