CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 27, 2020	Dec. 29, 2019
Current assets:
Cash and cash equivalents	$ 374.7	$ 172.6
Restricted cash	0.7	0.0
Accounts receivable, net	83.9	85.0
Unbilled receivables, net	192.7	179.4
Inventoried costs	78.3	61.1
Prepaid expenses	17.9	9.4
Other current assets	22.6	11.4
Current assets of discontinued operations	0.0	3.3
Total current assets	770.8	522.2
Property, plant and equipment, net	136.1	116.9
Operating lease right-of-use assets	40.1	42.1
Goodwill	475.3	455.6
Intangible assets, net	42.0	39.5
Other assets	8.9	9.7
Total assets	1,473.2	1,186.0
Current liabilities:
Accounts payable	54.7	53.8
Accrued expenses	28.8	32.7
Accrued compensation	45.4	37.1
Accrued interest	6.4	1.6
Billings in excess of costs and earnings on uncompleted contracts	36.3	34.3
Current portion of operating lease liabilities	8.9	9.9
Other current liabilities	16.2	10.0
Current liabilities of discontinued operations	3.0	3.3
Total current liabilities	199.7	182.7
Long-term debt	300.3	295.1
Operating lease liabilities, net of current portion	35.7	37.6
Other long-term liabilities	84.7	78.7
Long-term liabilities of discontinued operations	2.6	2.8
Total liabilities	623.0	596.9
Commitments and contingencies (Note 15)
Redeemable noncontrolling interest	14.9	15.0
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at September 27, 2020 and December 29, 2019	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 122,755,405 and 106,635,508 shares issued and outstanding at September 27, 2020 and December 29, 2019, respectively	0.0	0.0
Additional paid-in capital	1,545.4	1,286.5
Accumulated other comprehensive loss	0.4	(0.4)
Accumulated deficit	(710.5)	(712.0)
Total stockholders’ equity	835.3	574.1
Total liabilities and stockholders’ equity	$ 1,473.2	$ 1,186.0