CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2023	Mar. 27, 2022
Operating activities:
Net loss	$ (5.8)	$ (15.9)
Loss from discontinued operations	0.0	(0.2)
Loss from continuing operations	(5.8)	(15.7)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities from continuing operations:
Depreciation and amortization	7.9	7.0
Amortization of lease right-of-use assets	2.7	2.6
Stock-based compensation	6.6	7.0
Amortization of deferred financing costs	0.2	0.3
Loss on extinguishment of debt	0.0	13.0
Provision for doubtful accounts	0.9	0.0
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(39.1)	31.9
Unbilled receivables	13.1	(19.8)
Inventoried costs	(8.3)	(15.3)
Prepaid expenses and other assets	(7.8)	(9.5)
Operating lease liabilities	(2.4)	(2.7)
Accounts payable	(1.8)	1.3
Accrued expenses	2.0	6.1
Accrued compensation	4.0	5.6
Accrued interest	0.0	(1.3)
Billings in excess of costs and earnings on uncompleted contracts	3.2	(8.3)
Income tax receivable and payable	(0.5)	(4.9)
Other liabilities	(0.6)	(5.2)
Net cash used in operating activities from continuing operations	(25.7)	(7.9)
Investing activities:
Cash paid for acquisitions, net of cash acquired	0.0	(58.5)
Capital expenditures	(7.7)	(10.8)
Net cash used in investing activities from continuing operations	(7.7)	(69.3)
Financing activities:
Proceeds from the issuance of long-term debt	0.0	200.0
Borrowing under credit facility	15.0	100.0
Redemption of Senior Secured Notes	0.0	(309.8)
Repayment under credit facility, term loan and other debt	(16.3)	0.0
Debt issuance costs	0.0	(3.2)
Payments under finance leases	(0.4)	(0.3)
Payments of employee taxes withheld from share-based awards	(2.6)	(6.8)
Proceeds from shares issued under equity plans	2.9	2.9
Net cash used in financing activities from continuing operations	(1.4)	(17.2)
Net cash used in continuing operations	(34.8)	(94.4)
Net operating cash flows of discontinued operations	0.0	0.1
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0.2	(0.7)
Net decrease in cash, cash equivalents and restricted cash	(34.6)	(95.0)
Cash, cash equivalents and restricted cash at beginning of period	81.3	349.4
Cash, cash equivalents and restricted cash at end of period	$ 46.7	$ 254.4