CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
Operating activities:
Net loss	$ (2.2)	$ (10.0)
Less: Income (loss) from discontinued operations	(3.5)	0.1
Income (loss) from continuing operations	1.3	(10.1)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by (used in) operating activities from continuing operations:
Depreciation and amortization	4.5	5.5
Stock-based compensation	1.7	2.1
Deferred income taxes	0.0	0.8
Amortization of deferred financing costs	0.2	0.4
Amortization of discount on Senior Secured Notes	0.0	0.2
Loss on extinguishment of debt	0.0	2.1
Changes in assets and liabilities, net of acquisitions:
Accounts receivable and unbilled receivables	2.2	1.6
Inventoried costs	1.3	(8.9)
Prepaid expenses and other assets	0.8	(3.8)
Accounts payable	(3.0)	0.1
Accrued compensation	3.8	(2.7)
Accrued expenses	(6.1)	0.0
Advance payments received on contracts	(0.6)	0.7
Accrued interest	4.9	6.0
Billings in excess of costs and earnings on uncompleted contracts	(3.7)	1.2
Income tax receivable and payable	0.2	0.4
Other liabilities	(1.0)	(1.0)
Net cash provided by (used in) operating activities from continuing operations	6.5	(5.4)
Investing activities:
Capital expenditures	(6.7)	(5.1)
Net cash used in investing activities from continuing operations	(6.7)	(5.1)
Financing activities:
Extinguishment of long-term debt	0.0	(64.0)
Debt issuance costs	(0.1)	0.0
Proceeds from the issuance of common stock	(1.1)	81.9
Repayment of debt	(0.2)	(0.3)
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	1.8	0.8
Net cash provided by financing activities from continuing operations	0.4	18.4
Net cash flows of continuing operations	0.2	7.9
Net operating cash flows of discontinued operations	(3.1)	(4.3)
Net investing cash flows of discontinued operations	0.0	(0.2)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0.2	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	(2.7)	3.4
Cash, cash equivalents and restricted cash at beginning of period	130.9	70.7
Cash, cash equivalents and restricted cash at end of period	$ 128.2	$ 74.1