Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 30, 2012	Sep. 30, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Condensed Financial Statements, Captions [Line Items]
Service revenues									$ 450.0	$ 351.0	$ 284.8
Product sales									519.2	362.9	123.7
Total revenues	263.6	276.3	219.8	209.5	213.4	206.6	171.1	122.8	969.2	713.9	408.5
Cost of service revenues									350.8	260.7	221.2
Cost of product sales									361.2	262.0	103.0
Total costs									712.0	522.7	324.2
Gross profit	68.0	74.1	57.7	57.4	59.4	59.0	45.4	27.4	257.2	191.2	84.3
Selling, general and administrative expenses									192.5	153.1
Impairment of goodwill and intangible assets									96.6	0	0
Research and development expenses									17.8	8.6	2.2
Operating income (loss) from continuing operations	(80.3)	14.1	7.4	9.1	9.7	9.7	8.7	1.4	(49.7)	29.5	23.1
Other income (expense):
Interest expense, net									(66.1)	(51.1)	(22.3)
Other income, net									1.3	0	1.1
Total other expense, net									(64.8)	(51.1)	(21.2)
Income (loss) from continuing operations before income taxes									(114.5)	(21.6)	1.9
Provision (benefit) for income taxes from continuing operations	(5.4)	1.3	6.6	(4.1)	0.6	1.6	0.9	(1.2)	(1.6)	1.9	(12.7)
Income (loss) from continuing operations									(112.9)	(23.5)	14.6
Loss from discontinued operations									(1.5)	(0.7)	(0.1)
Equity in net income (loss) of subsidiaries									0	0
Net income (loss)									(114.4)	(24.2)
Comprehensive income (loss)									(115.0)	(24.4)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues									0	0
Product sales									0	0
Total revenues									0	0
Cost of service revenues									0	0
Cost of product sales									0	0
Total costs									0	0
Gross profit									0	0
Selling, general and administrative expenses									7.4	15.9
Impairment of goodwill and intangible assets									0
Research and development expenses									0	0
Operating income (loss) from continuing operations									(7.4)	(15.9)
Other income (expense):
Interest expense, net									(65.9)	(50.8)
Other income, net									0.3	0.3
Total other expense, net									(65.6)	(50.5)
Income (loss) from continuing operations before income taxes									(73.0)	(66.4)
Provision (benefit) for income taxes from continuing operations									20.8	0
Income (loss) from continuing operations									(93.8)	(66.4)
Loss from discontinued operations									(0.1)	0
Equity in net income (loss) of subsidiaries									(20.5)	42.2
Net income (loss)									(114.4)	(24.2)
Comprehensive income (loss)									(115.0)	(24.4)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									448.5	349.3
Product sales									470.0	327.4
Total revenues									918.5	676.7
Cost of service revenues									350.0	259.2
Cost of product sales									333.8	242.5
Total costs									683.8	501.7
Gross profit									234.7	175.0
Selling, general and administrative expenses									171.2	122.3
Impairment of goodwill and intangible assets									96.6
Research and development expenses									16.9	7.9
Operating income (loss) from continuing operations									(50.0)	44.8
Other income (expense):
Interest expense, net									0.3	0.1
Other income, net									0.1	0.4
Total other expense, net									0.4	0.5
Income (loss) from continuing operations before income taxes									(49.6)	45.3
Provision (benefit) for income taxes from continuing operations									(22.8)	3.0
Income (loss) from continuing operations									(26.8)	42.3
Loss from discontinued operations									(2.2)	(0.8)
Equity in net income (loss) of subsidiaries									8.3	0.5
Net income (loss)									(20.7)	42.0
Comprehensive income (loss)									(20.9)	41.7
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									1.5	1.7
Product sales									64.5	46.9
Total revenues									66.0	48.6
Cost of service revenues									0.8	1.5
Cost of product sales									42.7	30.9
Total costs									43.5	32.4
Gross profit									22.5	16.2
Selling, general and administrative expenses									13.9	14.9
Impairment of goodwill and intangible assets									0
Research and development expenses									0.9	0.7
Operating income (loss) from continuing operations									7.7	0.6
Other income (expense):
Interest expense, net									(0.5)	(0.4)
Other income, net									0.9	(0.7)
Total other expense, net									0.4	(1.1)
Income (loss) from continuing operations before income taxes									8.1	(0.5)
Provision (benefit) for income taxes from continuing operations									0.4	(1.1)
Income (loss) from continuing operations									7.7	0.6
Loss from discontinued operations									0.8	0.1
Equity in net income (loss) of subsidiaries									0	0
Net income (loss)									8.5	0.7
Comprehensive income (loss)									9.4	0.8
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues									0	0
Product sales									(15.3)	(11.4)
Total revenues									(15.3)	(11.4)
Cost of service revenues									0	0
Cost of product sales									(15.3)	(11.4)
Total costs									(15.3)	(11.4)
Gross profit									0	0
Selling, general and administrative expenses									0	0
Impairment of goodwill and intangible assets									0
Research and development expenses									0	0
Operating income (loss) from continuing operations									0	0
Other income (expense):
Interest expense, net									0	0
Other income, net									0	0
Total other expense, net									0	0
Income (loss) from continuing operations before income taxes									0	0
Provision (benefit) for income taxes from continuing operations									0	0
Income (loss) from continuing operations									0	0
Loss from discontinued operations									0	0
Equity in net income (loss) of subsidiaries									12.2	(42.7)
Net income (loss)									12.2	(42.7)
Comprehensive income (loss)									$ 11.5	$ (42.5)