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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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