CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Service revenues	$ 354.2	$ 390.8	$ 443.6
Product sales	302.9	372.2	400.5
Total revenues	657.1	763.0	844.1
Cost of service revenues	266.5	304.6	335.2
Cost of product sales	228.8	279.0	304.4
Total costs	495.3	583.6	639.6
Gross profit	161.8	179.4	204.5
Selling, general and administrative expenses	150.7	153.6	172.8
Merger and acquisition related items	0.1	0.2	(3.8)
Research and development expenses	16.2	18.6	19.7
Unused office space and other restructuring	(0.7)	1.7	(2.4)
Operating income (loss) from continuing operations	(4.5)	5.3	18.2
Other income (expense):
Interest expense, net	(36.0)	(39.2)	(46.2)
Loss on extinguishment of debt	(3.4)	(39.1)	0.0
Other income (expense), net	(0.7)	1.2	(0.4)
Total other expense, net	(40.1)	(77.1)	(46.6)
Loss from continuing operations before income taxes	(44.6)	(71.8)	(28.4)
Provision (benefit) for income taxes from continuing operations	(11.4)	3.9	1.1
Income (loss) from continuing operations	(33.2)	(75.7)	(29.5)
Income (loss) from operations of discontinued component (including gain on disposal of $80.8 million for the year ended December 27, 2015)	75.5	(1.1)	(8.8)
Income tax expense (benefit)	22.5	1.2	(1.1)
Income (loss) from discontinued operations	53.0	(2.3)	(7.7)
Net income (loss)	$ 19.8	$ (78.0)	$ (37.2)
Basic income and loss per common share:
Net income (loss) from continuing operations (in dollars per share)	$ (0.56)	$ (1.31)	$ (0.52)
Net income (loss) from discontinued operations (in dollars per share)	0.90	(0.04)	(0.13)
Net income (loss) per common share (in dollars per share)	0.34	(1.35)	(0.65)
Diluted income and loss per common share:
Net income (loss) from continuing operations (in dollars per share)	(0.56)	(1.31)	(0.52)
Net income (loss) from discontinued operations (in dollars per share)	0.90	(0.04)	(0.13)
Net income (loss) per common share (in dollars per share)	$ 0.34	$ (1.35)	$ (0.65)
Weighted average common shares outstanding:
Basic (in shares)	58.7	57.6	56.8
Diluted (in shares)	58.7	57.6	56.8
Comprehensive Income (Loss)
Net income (loss) from above	$ 19.8	$ (78.0)	$ (37.2)
Other comprehensive income (loss):
Change in cumulative translation adjustment	0.1	(0.4)	0.0
Postretirement benefit reserve adjustment net of tax expense	0.2	(0.5)	0.0
Other comprehensive income (loss), net of tax	0.3	(0.9)	0.0
Comprehensive income (loss)	$ 20.1	$ (78.9)	$ (37.2)