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Revenue and Related Balance Sheet Accounts - Revenue by Contract Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,982,781	$ 2,637,229	$ 2,899,276
Unit-price contracts
Disaggregation of Revenue [Line Items]
Total revenue	1,660,990	1,508,683	1,570,356
Time and materials contracts
Disaggregation of Revenue [Line Items]
Total revenue	692,986	589,018	655,315
Fixed-price contracts
Disaggregation of Revenue [Line Items]
Total revenue	628,805	539,528	673,605
Master services agreements
Disaggregation of Revenue [Line Items]
Total revenue	2,326,943	2,121,144	2,388,688
Bid contracts
Disaggregation of Revenue [Line Items]
Total revenue	$ 655,838	$ 516,085	$ 510,588

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