CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Operating activities:
Net income	$ 11.9	$ 4.5
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	16.8	10.4
Deferred income taxes	1.2	0.0
Amortization of lease right-of-use assets	3.4	3.0
Stock-based compensation	15.0	8.7
Amortization of deferred financing costs	0.1	0.2
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(2.0)	0.8
Unbilled receivables	(26.7)	(38.0)
Inventoried costs	(14.7)	(5.4)
Prepaid expenses and other assets	(26.5)	(12.8)
Operating lease liabilities	(3.7)	(3.0)
Accounts payable	30.8	0.7
Accrued expenses	(16.1)	5.4
Accrued compensation	(6.4)	(1.8)
Billings in excess of costs and earnings on uncompleted contracts	0.1	(0.7)
Income tax receivable and payable	(3.8)	(1.1)
Other liabilities	(6.8)	(0.1)
Net cash used in operating activities	(27.4)	(29.2)
Investing activities:
Cash paid for acquisitions, net of cash acquired	(347.4)	0.0
Investment in joint venture	(2.0)	0.0
Proceeds from sale of assets	4.2	0.0
Capital expenditures	(19.9)	(22.6)
Net cash used in investing activities	(365.1)	(22.6)
Financing activities:
Proceeds from the issuance of common stock, net of issuance costs	1,348.6	0.0
Repayment under credit facility and term loan	0.0	(2.5)
Debt issuance costs	(1.1)	0.0
Payments under finance leases	(0.9)	(0.4)
Payments of employee taxes withheld from share-based awards	(54.9)	(16.2)
Proceeds from shares issued under equity plans	5.3	4.6
Proceeds from state grant for capital construction	0.3	0.0
Net cash provided by (used in) financing activities	1,297.3	(14.5)
Net cash provided (used)	904.8	(66.3)
Effect of exchange rate changes on cash and cash equivalents	(1.1)	0.7
Net increase (decrease) in cash and cash equivalents	903.7	(65.6)
Cash and cash equivalents at beginning of period	560.6	329.3
Cash and cash equivalents at end of period	1,464.3	263.7
Non-cash investing and financing activities:
Financing lease obligation incurred	37.3	0.0
Capital expenditures included in accounts payable and accrued expenses	6.8	6.0
Common stock issuance for acquisition	$ 88.8	$ 32.2