CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 27, 2020	Dec. 29, 2019
Current assets:
Cash and cash equivalents	$ 380,800,000	$ 172,600,000
Restricted cash	700,000	0
Accounts receivable, net	95,300,000	85,000,000.0
Unbilled receivables, net	177,000,000.0	179,400,000
Inventoried costs	81,200,000	61,100,000
Prepaid expenses	12,000,000.0	9,400,000
Other current assets	17,800,000	11,400,000
Current assets of discontinued operations	0	3,300,000
Total current assets	764,800,000	522,200,000
Property, plant and equipment, net	143,800,000	116,900,000
Operating lease right-of-use assets	42,900,000	42,100,000
Goodwill	483,900,000	455,600,000
Intangible assets, net	43,000,000.0	39,500,000
Other assets	84,400,000	9,700,000
Total assets	1,562,800,000	1,186,000,000.0
Current liabilities:
Accounts payable	55,400,000	53,800,000
Accrued expenses	34,700,000	32,700,000
Accrued compensation	48,100,000	37,100,000
Accrued interest	1,500,000	1,600,000
Billings in excess of costs and earnings on uncompleted contracts	34,000,000.0	34,300,000
Current portion of operating lease liabilities	8,900,000	9,900,000
Other current liabilities	11,900,000	10,000,000.0
Current liabilities of discontinued operations	3,100,000	3,300,000
Total current liabilities	197,600,000	182,700,000
Long-term debt	301,000,000.0	295,100,000
Operating lease liabilities, net of current portion	38,600,000	37,600,000
Other long-term liabilities	83,000,000.0	78,700,000
Long-term liabilities of discontinued operations	2,500,000	2,800,000
Total liabilities	622,700,000	596,900,000
Commitments and contingencies
Redeemable noncontrolling interest	14,800,000	15,000,000.0
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 authorized, 0 shares outstanding at December 27, 2020 and December 29, 2019	0	0
Common stock, $0.001 par value, 195,000,000 shares authorized; 123,047,147 and 106,635,508 shares issued and outstanding at December 27, 2020 and December 29, 2019, respectively	0	0
Additional paid-in capital	1,556,300,000	1,286,500,000
Accumulated other comprehensive loss	1,400,000	(400,000)
Accumulated deficit	(632,400,000)	(712,000,000.0)
Total stockholders’ equity	925,300,000	574,100,000
Total liabilities and stockholders’ equity	$ 1,562,800,000	$ 1,186,000,000.0