CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Total revenues	$ 618.0	$ 603.3	$ 541.9
Total costs	448.3	445.7	421.4
Gross profit	169.7	157.6	120.5
Selling, general and administrative expenses	119.8	127.3	114.6
Research and development expenses	15.6	17.8	13.9
Impairment of goodwill	0.0	24.2	0.0
Restructuring expenses and other	3.8	0.3	10.0
Operating income (loss) from continuing operations	30.5	(12.0)	(18.0)
Other income (expense):
Interest expense, net	(20.8)	(28.6)	(34.7)
Gain (loss) on extinguishment of debt	0.0	(17.3)	0.2
Other income (loss), net	(1.0)	0.8	0.7
Total other expense, net	(21.8)	(45.1)	(33.8)
Income (loss) from continuing operations before income taxes	8.7	(57.1)	(51.8)
Provision (benefit) for income taxes from continuing operations	4.6	(10.2)	5.8
Income (loss) from continuing operations	4.1	(46.9)	(57.6)
Income (loss) from operations of discontinued component (including gain on disposal of $0.0 million for the year ended December 30, 2018)	(9.4)	6.3	(0.6)
Income tax expense (benefit)	(1.8)	2.1	2.3
Income (loss) from discontinued operations	(7.6)	4.2	(2.9)
Net loss	$ (3.5)	$ (42.7)	$ (60.5)
Basic income and loss per common share:
Income (loss) from continuing operations (in dollars per share)	$ 0.04	$ (0.52)	$ (0.94)
Income (loss) from discontinued operations (in dollars per share)	(0.07)	0.04	(0.05)
Net income (loss) per common share (in dollars per share)	(0.03)	(0.48)	(0.99)
Diluted income and loss per common share:
Income (loss) from continuing operations (in dollars per share)	0.04	(0.52)	(0.94)
Income (loss) from discontinued operations (in dollars per share)	(0.07)	0.04	(0.05)
Net income (loss) per common share (in dollars per share)	$ (0.03)	$ (0.48)	$ (0.99)
Weighted average common shares outstanding:
Basic (in shares)	103.8	89.5	61.3
Diluted (in shares)	106.1	89.5	61.3
Comprehensive Loss
Net income (loss)	$ (3.5)	$ (42.7)	$ (60.5)
Other comprehensive income (loss):
Change in cumulative translation adjustment	0.4	0.1	(0.5)
Postretirement benefit reserve adjustment net of tax expense	0.3	0.2	0.2
Other comprehensive income (loss), net of tax	0.7	0.3	(0.3)
Comprehensive loss	(2.8)	(42.4)	(60.8)
Service
Total revenues	200.7	197.8	221.3
Total costs	137.8	138.6	162.1
Product
Total revenues	417.3	405.5	320.6
Total costs	$ 310.5	$ 307.1	$ 259.3