CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 30, 2018
Current assets:
Cash and cash equivalents	$ 178.4	$ 182.7
Restricted cash	0.0	0.3
Accounts receivable, net	81.3	64.6
Unbilled receivables, net	158.0	172.8
Inventoried costs	69.2	46.8
Prepaid expenses	13.3	8.9
Other current assets	9.6	10.3
Current assets of discontinued operations	7.3	8.3
Total current assets	517.1	494.7
Property, plant and equipment, net	113.5	67.1
Operating lease right-of-use assets	38.1
Goodwill	459.4	425.7
Intangible assets, net	34.4	16.1
Other assets	6.4	6.5
Total assets	1,168.9	1,010.1
Current liabilities:
Accounts payable	47.4	46.6
Accrued expenses	36.6	38.1
Accrued compensation	37.2	33.5
Accrued interest	6.5	1.6
Billings in excess of costs and earnings on uncompleted contracts	39.7	34.9
Current portion of operating lease liabilities	13.3
Other current liabilities	9.3	4.7
Current liabilities of discontinued operations	5.3	5.3
Total current liabilities	195.3	164.7
Long-term debt principal, net of current portion	294.4	294.2
Operating lease liabilities, net of current portion	31.3
Other long-term liabilities	73.5	25.5
Long-term liabilities of discontinued operations	6.5	6.4
Total liabilities	601.0	490.8
Commitments and contingencies
Redeemable noncontrolling interest (Note 12)	15.0	0.0
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at March 31, 2019 and December 30, 2018	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 105,885,792 and 103,766,899 shares issued and outstanding at March 31, 2019 and December 30, 2018, respectively	0.0	0.0
Additional paid-in capital	1,275.0	1,244.5
Accumulated other comprehensive loss	(0.7)	(0.7)
Accumulated deficit	(721.4)	(724.5)
Total stockholders’ equity	552.9	519.3
Total liabilities and stockholders’ equity	$ 1,168.9	$ 1,010.1