Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Condensed Financial Statements, Captions [Line Items]
Service revenues									$ 443.6	$ 450.0	$ 351.0
Product sales									507.0	519.2	362.9
Total revenues	235.7	226.4	235.2	253.3	263.6	276.3	219.8	209.5	950.6	969.2	713.9
Cost of service revenues									335.2	350.8	260.7
Cost of product sales									375.4	361.2	262.0
Total costs									710.6	712.0	522.7
Gross profit	61.5	52.3	60.4	65.8	68.0	74.1	57.7	57.4	240.0	257.2	191.2
Selling, general and administrative expenses									186.8	192.5	153.1
Impairment of goodwill and intangible assets									0	96.6	0
Research and development expenses									21.4	17.8	8.6
Operating income (loss) from continuing operations	5.4	6.1	8.9	11.4	(80.3)	14.1	7.4	9.1	31.8	(49.7)	29.5
Other income (expense):
Interest expense, net									(63.7)	(66.1)	(51.1)
Other income, net									0	1.3	0
Total other expense, net									(63.7)	(64.8)	(51.1)
Loss from continuing operations before income taxes									(31.9)	(114.5)	(21.6)
Provision (benefit) for income taxes from continuing operations	(2.9)	0.2	(0.1)	2.8	(5.4)	1.3	6.6	(4.1)	0	(1.6)	1.9
Loss from continuing operations									(31.9)	(112.9)	(23.5)
Loss from discontinued operations									(5.3)	(1.5)	(0.7)
Equity in net income (loss) of subsidiaries									0	0	0
Net income (loss)									(37.2)	(114.4)	(24.2)
Comprehensive income (loss)									(37.2)	(115.0)	(24.4)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues									0	0	0
Product sales									0	0	0
Total revenues									0	0	0
Cost of service revenues									0	0	0
Cost of product sales									0	0	0
Total costs									0	0	0
Gross profit									0	0	0
Selling, general and administrative expenses									5.5	7.4	15.9
Impairment of goodwill and intangible assets									0	0
Research and development expenses									0	0	0
Operating income (loss) from continuing operations									(5.5)	(7.4)	(15.9)
Other income (expense):
Interest expense, net									(65.6)	(65.9)	(50.8)
Other income, net									0	0.3	0.3
Total other expense, net									(65.6)	(65.6)	(50.5)
Loss from continuing operations before income taxes									(71.1)	(73.0)	(66.4)
Provision (benefit) for income taxes from continuing operations									0.6	20.8	0
Loss from continuing operations									(71.7)	(93.8)	(66.4)
Loss from discontinued operations									0.1	(0.1)	0
Equity in net income (loss) of subsidiaries									34.4	(20.5)	42.2
Net income (loss)									(37.2)	(114.4)	(24.2)
Comprehensive income (loss)									(37.2)	(115.0)	(24.4)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									438.2	448.5	349.3
Product sales									448.6	470.0	327.4
Total revenues									886.8	918.5	676.7
Cost of service revenues									331.3	350.0	259.2
Cost of product sales									338.9	333.8	242.5
Total costs									670.2	683.8	501.7
Gross profit									216.6	234.7	175.0
Selling, general and administrative expenses									167.2	171.2	122.3
Impairment of goodwill and intangible assets									0	96.6
Research and development expenses									20.2	16.9	7.9
Operating income (loss) from continuing operations									29.2	(50.0)	44.8
Other income (expense):
Interest expense, net									2.3	0.3	0.1
Other income, net									(0.3)	0.1	0.4
Total other expense, net									2.0	0.4	0.5
Loss from continuing operations before income taxes									31.2	(49.6)	45.3
Provision (benefit) for income taxes from continuing operations									(0.7)	(22.8)	3.0
Loss from continuing operations									31.9	(26.8)	42.3
Loss from discontinued operations									(5.4)	(2.2)	(0.8)
Equity in net income (loss) of subsidiaries									7.9	8.3	0.5
Net income (loss)									34.4	(20.7)	42.0
Comprehensive income (loss)									34.4	20.9	41.7
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									5.4	1.5	1.7
Product sales									75.3	64.5	46.9
Total revenues									80.7	66.0	48.6
Cost of service revenues									3.9	0.8	1.5
Cost of product sales									53.4	42.7	30.9
Total costs									57.3	43.5	32.4
Gross profit									23.4	22.5	16.2
Selling, general and administrative expenses									14.1	13.9	14.9
Impairment of goodwill and intangible assets									0	0
Research and development expenses									1.2	0.9	0.7
Operating income (loss) from continuing operations									8.1	7.7	0.6
Other income (expense):
Interest expense, net									(0.4)	(0.5)	(0.4)
Other income, net									0.3	0.9	(0.7)
Total other expense, net									(0.1)	0.4	(1.1)
Loss from continuing operations before income taxes									8.0	8.1	(0.5)
Provision (benefit) for income taxes from continuing operations									0.1	0.4	(1.1)
Loss from continuing operations									7.9	7.7	0.6
Loss from discontinued operations									0	0.8	0.1
Equity in net income (loss) of subsidiaries									0	0	0
Net income (loss)									7.9	8.5	0.7
Comprehensive income (loss)									7.9	9.4	0.8
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues									0	0	0
Product sales									(16.9)	(15.3)	(11.4)
Total revenues									(16.9)	(15.3)	(11.4)
Cost of service revenues									0	0	0
Cost of product sales									(16.9)	(15.3)	(11.4)
Total costs									(16.9)	(15.3)	(11.4)
Gross profit									0	0	0
Selling, general and administrative expenses									0	0	0
Impairment of goodwill and intangible assets									0	0
Research and development expenses									0	0	0
Operating income (loss) from continuing operations									0	0	0
Other income (expense):
Interest expense, net									0	0	0
Other income, net									0	0	0
Total other expense, net									0	0	0
Loss from continuing operations before income taxes									0	0	0
Provision (benefit) for income taxes from continuing operations									0	0	0
Loss from continuing operations									0	0	0
Loss from discontinued operations									0	0	0
Equity in net income (loss) of subsidiaries									(42.3)	12.2	(42.7)
Net income (loss)									(42.3)	12.2	(42.7)
Comprehensive income (loss)									$ (42.3)	$ 11.5	$ (42.5)