v3.26.1
Revenue - Schedule of Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 $ 395 $ 778 $ 764 $ 1,945
Revenue 156,377 59,063 317,063 120,359
Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,072 5,080 17,919 12,434
Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 152,910 53,205 298,380 105,980
Combined ATS development and Wafer Services        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 395 778 764 1,945
Revenue 154,581 58,016 305,365 118,078
Combined ATS development and Wafer Services | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,276 4,033 6,221 10,153
Combined ATS development and Wafer Services | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 152,910 53,205 298,380 105,980
Advanced Technology Services (ATS) Development        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 0 778 0 1,945
Revenue 63,213 52,605 118,149 105,140
Advanced Technology Services (ATS) Development | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,276 3,737 6,221 9,773
Advanced Technology Services (ATS) Development | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 61,937 48,090 111,928 93,422
Time-and-materials and cost-plus-fixed-fee contracts        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 0 0 0 0
Revenue 22,685 36,566 50,610 73,645
Time-and-materials and cost-plus-fixed-fee contracts | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 0 0 0 1,204
Time-and-materials and cost-plus-fixed-fee contracts | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 22,685 36,566 50,610 72,441
Fixed price contracts        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 0 0 0 0
Revenue 40,528 15,261 67,539 29,550
Fixed price contracts | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,276 3,737 6,221 8,569
Fixed price contracts | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 39,252 11,524 61,318 20,981
Other        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842   778   1,945
Revenue   778   1,945
Other | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue   0   0
Other | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue   0   0
Wafer Services        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 395 0 764 0
Revenue 91,368 5,411 187,216 12,938
Wafer Services | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 0 296 0 380
Wafer Services | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 90,973 5,115 186,452 12,558
Tools        
Disaggregation of Revenue [Line Items]        
Lease Revenue Per Topic 842 0 0 0 0
Revenue 1,796 1,047 11,698 2,281
Tools | Point-in-Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,796 1,047 11,698 2,281
Tools | Over Time        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 0 $ 0 $ 0 $ 0