CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2019	Dec. 30, 2018
Current assets:
Cash and cash equivalents	$ 176.2	$ 182.7
Restricted cash	0.0	0.3
Accounts receivable, net	67.8	64.6
Unbilled receivables, net	169.1	172.8
Inventoried costs	75.4	46.8
Prepaid expenses	10.3	8.9
Other current assets	11.9	10.3
Current assets of discontinued operations	5.3	8.3
Total current assets	516.0	494.7
Property, plant and equipment, net	115.5	67.1
Operating lease right-of-use assets	43.8
Goodwill	459.4	425.7
Intangible assets, net	32.4	16.1
Other assets	6.5	6.5
Total assets	1,173.6	1,010.1
Current liabilities:
Accounts payable	52.7	46.6
Accrued expenses	39.2	38.1
Accrued compensation	32.1	33.5
Accrued interest	1.6	1.6
Billings in excess of costs and earnings on uncompleted contracts	38.8	34.9
Current portion of operating lease liabilities	12.1
Other current liabilities	8.9	4.7
Current liabilities of discontinued operations	3.5	5.3
Total current liabilities	188.9	164.7
Long-term debt principal, net of current portion	294.6	294.2
Operating lease liabilities, net of current portion	37.8
Other long-term liabilities	74.6	25.5
Long-term liabilities of discontinued operations	2.8	6.4
Total liabilities	598.7	490.8
Commitments and contingencies
Redeemable noncontrolling interest	15.4	0.0
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at June 30, 2019 and December 30, 2018	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 105,914,292 and 103,766,899 shares issued and outstanding at June 30, 2019 and December 30, 2018, respectively	0.0	0.0
Additional paid-in capital	1,277.8	1,244.5
Accumulated other comprehensive loss	(0.8)	(0.7)
Accumulated deficit	(717.5)	(724.5)
Total stockholders’ equity	559.5	519.3
Total liabilities and stockholders’ equity	$ 1,173.6	$ 1,010.1