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Revenue - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | $ 4,668 | $ 4,668 | $ 4,668
Total Revenue |  | 342,269 | 286,682 | 212,941
Revenue recognized from contracts |  | 63,575 | 22,014 |
Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 91,231 | 22,215 | 21,758
Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 246,370 | 259,799 | 186,515
Combined ATS development and Wafer Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 4,668 | 4,668 | 4,668
Total Revenue |  | 265,506 | 272,031 | 211,395
Combined ATS development and Wafer Services | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 14,468 | 7,564 | 20,212
Combined ATS development and Wafer Services | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 246,370 | 259,799 | 186,515
Advanced Technology Services (ATS) Development |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 4,668 | 4,668 | 4,668
Total Revenue |  | 238,645 | 210,904 | 137,900
Advanced Technology Services (ATS) Development | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 12,665 | 0 | 0
Advanced Technology Services (ATS) Development | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 221,312 | 206,236 | 133,232
Time-and-materials and cost-plus-fixed-fee contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 0 | 0 | 0
Total Revenue |  | 140,482 | 122,343 | 85,294
Time-and-materials and cost-plus-fixed-fee contracts | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 0 | 0 | 0
Time-and-materials and cost-plus-fixed-fee contracts | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 140,482 | 122,343 | 85,294
Fixed price contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 0 | 0 | 0
Total Revenue |  | 93,495 | 83,893 | 47,938
Fixed price contracts | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 12,665 | 0 | 0
Fixed price contracts | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 80,830 | 83,893 | 47,938
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 4,668 | 4,668 | 4,668
Total Revenue |  | 4,668 | 4,668 | 4,668
Other | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 0 | 0 | 0
Other | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 0 | 0 | 0
Wafer Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 0 | 0 | 0
Total Revenue |  | 26,861 | 61,127 | 73,495
Wafer Services | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 1,803 | 7,564 | 20,212
Revenue recognized from contracts |  |  |  | 11,049
Wafer Services | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | $ 8,290 | 25,058 | 53,563 | 53,283
Revenue recognized from contracts |  |  |  | 48,798
Tools |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease Revenue Per Topic 842 |  | 0 | 0 | 0
Total Revenue |  | 76,763 | 14,651 | 1,546
Tools | Point-in-Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | 76,763 | 14,651 | 1,546
Tools | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  | $ 0 | $ 0 | $ 0

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