CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 28, 2021	Dec. 27, 2020
Current assets:
Cash and cash equivalents	$ 383.6	$ 380.8
Restricted cash	0.0	0.7
Accounts receivable, net	85.7	95.3
Unbilled receivables, net	178.9	177.0
Inventoried costs	85.7	81.2
Prepaid expenses	13.5	12.0
Other current assets	21.2	17.8
Total current assets	768.6	764.8
Property, plant and equipment, net	146.9	143.8
Operating lease right-of-use assets	40.8	42.9
Goodwill	483.7	483.9
Intangible assets, net	41.6	43.0
Other assets	83.6	84.4
Total assets	1,565.2	1,562.8
Current liabilities:
Accounts payable	51.9	55.4
Accrued expenses	32.0	34.7
Accrued compensation	54.2	48.1
Accrued interest	6.4	1.5
Billings in excess of costs and earnings on uncompleted contracts	41.1	34.0
Current portion of operating lease liabilities	8.9	8.9
Other current liabilities	13.0	11.9
Current liabilities of discontinued operations	2.7	3.1
Total current liabilities	210.2	197.6
Long-term debt	300.3	301.0
Operating lease liabilities, net of current portion	36.4	38.6
Other long-term liabilities	72.0	83.0
Long-term liabilities of discontinued operations	2.5	2.5
Total liabilities	621.4	622.7
Commitments and contingencies
Redeemable noncontrolling interest	14.8	14.8
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at March 28, 2021 and December 27, 2020	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 123,738,251 and 123,047,147 shares issued and outstanding at March 28, 2021 and December 27, 2020, respectively	0.0	0.0
Additional paid-in capital	1,557.9	1,556.3
Accumulated other comprehensive loss	1.6	1.4
Accumulated deficit	(630.5)	(632.4)
Total stockholders’ equity	929.0	925.3
Total liabilities and stockholders’ equity	$ 1,565.2	$ 1,562.8