CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Operating activities:
Net income from consolidated operations	$ 22.0	$ 16.3	$ 2.4
Adjustments to reconcile income from consolidated operations to net cash provided by (used in) operating activities:
Depreciation and amortization	47.1	40.3	33.2
Deferred income taxes	8.1	4.4	2.5
Amortization of lease right-of-use assets	12.2	11.6	11.5
Stock-based compensation	35.5	29.8	25.3
Loss on extinguishment of debt	0.5	0.0	0.0
Amortization of deferred financing costs	0.5	0.7	0.7
Provision for doubtful accounts	0.0	0.0	1.0
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(44.6)	11.2	(13.1)
Unbilled receivables	(81.4)	(6.1)	14.4
Inventoried costs	(19.3)	(5.0)	(29.6)
Prepaid expenses	5.1	(1.8)	(3.9)
Other assets	(27.1)	(35.6)	(12.3)
Operating lease liabilities	(12.1)	(12.4)	(11.4)
Accounts payable	(13.7)	15.1	4.4
Accrued expenses	22.1	1.7	1.4
Accrued compensation	10.7	7.0	12.4
Billings in excess of costs and earnings on uncompleted contracts	(5.5)	(25.7)	28.4
Income tax receivable and payable	0.9	(0.3)	(0.5)
Other liabilities	(3.1)	(1.5)	(1.6)
Net cash provided by (used in) operating activities	(42.1)	49.7	65.2
Investing activities:
Cash paid for acquisitions, net of cash acquired	0.0	(11.5)	0.3
Proceeds from sale of assets	12.0	0.0	8.3
Investment in joint venture	(5.0)	0.0	0.0
Capital expenditures	(95.3)	(58.2)	(52.4)
Net cash used in investing activities	(88.3)	(69.7)	(43.8)
Financing activities:
Proceeds from the issuance of common stock, net of issuance costs	555.9	330.7	0.0
Borrowing under credit facility	0.0	10.0	69.0
Repayment under credit facility, term loan and other debt	(185.0)	(52.5)	(101.0)
Payments of employee taxes withheld from share-based awards	(20.0)	(17.4)	(3.7)
Payments under finance leases	(1.8)	(1.4)	(1.5)
Proceeds from shares issued under equity plans	9.9	8.2	6.5
Proceeds from state grant for capital construction	1.7	0.0	0.0
Net cash provided by (used in) financing activities	360.7	277.6	(30.7)
Net cash provided (used)	230.3	257.6	(9.3)
Effect of exchange rate changes on cash and cash equivalents	1.0	(1.1)	0.8
Net increase (decrease) in cash and cash equivalents	231.3	256.5	(8.5)
Cash, and cash equivalents at beginning of year	329.3	72.8	81.3
Cash and cash equivalents at end of year	560.6	329.3	72.8
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	6.3	14.6	19.6
Net cash paid during the year for income taxes	6.5	5.0	6.5
Non-cash financing and investing activities:
Financing lease obligations incurred	34.8	15.4	6.9
Capital expenditures included in accounts payable and accrued expenses	8.2	8.8	0.6
Common stock issuance for purchase of noncontrolling interests	0.0	11.3	10.7
Common stock issuance for acquisition	37.2	0.5	14.8
Common stock issued for contingent acquisition consideration	$ 0.5	$ 0.0	$ 0.0