Summary of Restructuring and Other Charges Activity by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 28, 2012		Sep. 30, 2011	Sep. 28, 2012		Sep. 30, 2011	Sep. 28, 2012 2012 Restructuring Plan		Sep. 28, 2012 2012 Restructuring Plan		Sep. 28, 2012 2012 Restructuring Plan Optical segment	Sep. 28, 2012 2012 Restructuring Plan Optical segment		Sep. 28, 2012 2012 Restructuring Plan Data segment		Sep. 28, 2012 2012 Restructuring Plan Data segment		Sep. 28, 2012 2012 Restructuring Plan Access segment		Sep. 28, 2012 2012 Restructuring Plan Access segment		Sep. 28, 2012 2012 Restructuring Plan Services segment	Sep. 28, 2012 2012 Restructuring Plan Services segment	Sep. 28, 2012 2011 Restructuring Plan	Sep. 28, 2012 2011 Restructuring Plan		Sep. 28, 2012 2011 Restructuring Plan Optical segment	Sep. 28, 2012 2011 Restructuring Plan Optical segment		Sep. 28, 2012 2011 Restructuring Plan Data segment	Sep. 28, 2012 2011 Restructuring Plan Data segment		Sep. 28, 2012 2011 Restructuring Plan Access segment	Sep. 28, 2012 2011 Restructuring Plan Access segment	Sep. 28, 2012 2011 Restructuring Plan Services segment	Sep. 28, 2012 2011 Restructuring Plan Services segment	Sep. 28, 2012 Previous Restructuring Plans	Sep. 28, 2012 Previous Restructuring Plans	Sep. 28, 2012 Previous Restructuring Plans Optical segment	Jun. 29, 2012 Previous Restructuring Plans Optical segment	Sep. 28, 2012 Previous Restructuring Plans Data segment	Sep. 28, 2012 Previous Restructuring Plans Data segment	Sep. 28, 2012 Previous Restructuring Plans Access segment	Sep. 28, 2012 Previous Restructuring Plans Access segment	Sep. 28, 2012 Previous Restructuring Plans Services segment	Sep. 28, 2012 Previous Restructuring Plans Services segment
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 21.9			$ 17.7			$ 12.1				$ 1.9			$ 8.7				$ 0.8				$ 0.7		$ 5.8	$ 12.6		$ 2.0	$ 4.4		$ 2.8	$ 5.5		$ 0.5	$ 1.1	$ 0.5	$ 1.6	$ 4.0	$ 5.1	$ 0.4	$ 0.2	$ 1.5	$ 1.9	$ 2.2	$ 2.6	$ 0.1	$ 0.2
Restructuring expense	3.3		19.5	110.2		20.5	3.1		108.4		0.7	4.7		1.6		99.8		0.3		1.6		0.5	2.3		1.7		0.3	1.9					0.1	0.1	(0.4)	(0.3)	0.2	0.1	(0.1)				0.2	0.2
Cash Payments	(4.6)			(31.2)			(2.3)		(20.2)		(0.4)	(1.6)		(1.4)		(16.6)		(0.1)		(0.5)		(0.4)	(1.5)	(1.9)	(9.6)		(1.2)	(4.6)		(0.5)	(3.0)		(0.2)	(0.8)		(1.2)	(0.4)	(1.4)	(0.1)		(0.1)	(0.5)	(0.2)	(0.6)	(0.1)	(0.2)
Other Activities	(1.3)	[1]		(77.4)	[1]		(1.3)	[1]	(76.6)	[1]		(0.9)	[1]	(1.2)	[1]	(75.5)	[1]	(0.1)	[1]	(0.2)	[1]				(0.8)	[1]		(0.6)	[1]		(0.2)	[1]
Ending Balance	$ 19.3			$ 19.3			$ 11.6		$ 11.6		$ 2.2	$ 2.2		$ 7.7		$ 7.7		$ 0.9		$ 0.9		$ 0.8	$ 0.8	$ 3.9	$ 3.9		$ 1.1	$ 1.1		$ 2.3	$ 2.3		$ 0.4	$ 0.4	$ 0.1	$ 0.1	$ 3.8	$ 3.8	$ 0.2	$ 0.2	$ 1.4	$ 1.4	$ 2.2	$ 2.2

[1] Other activities include accelerated amortization related to abandoned intangible assets, accelerated depreciation of property, plant and equipment to be disposed, the effects of currency translation as well as other changes that do not flow through restructuring expense.