Restructuring and Other Charges - Additional Information (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
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012 January 2012 Restructuring Plan	Sep. 28, 2012 January 2012 Restructuring Plan	Sep. 28, 2012 January 2012 Restructuring Plan Optical segment	Sep. 28, 2012 January 2012 Restructuring Plan Data segment	Sep. 28, 2012 January 2012 Restructuring Plan Access segment	Sep. 28, 2012 January 2012 Restructuring Plan Services segment	Sep. 28, 2012 July 2011 Restructuring Plan	Sep. 28, 2012 July 2011 Restructuring Plan	Sep. 28, 2012 July 2011 Restructuring Plan Optical segment	Sep. 28, 2012 July 2011 Restructuring Plan Data segment	Sep. 28, 2012 July 2011 Restructuring Plan Access segment	Sep. 28, 2012 July 2011 Restructuring Plan Services segment	Sep. 28, 2012 Previous Restructuring Plans	Sep. 28, 2012 Severance and other termination benefits	Sep. 30, 2011 Severance and other termination benefits	Sep. 28, 2012 Severance and other termination benefits	Sep. 30, 2011 Severance and other termination benefits	Sep. 28, 2012 Severance and other termination benefits January 2012 Restructuring Plan	Sep. 28, 2012 Severance and other termination benefits January 2012 Restructuring Plan	Sep. 28, 2012 Severance and other termination benefits July 2011 Restructuring Plan	Sep. 28, 2012 Severance and other termination benefits July 2011 Restructuring Plan	Sep. 28, 2012 Severance and other termination benefits Previous Restructuring Plans	Sep. 28, 2012 Facility- And Asset-Related Charges January 2012 Restructuring Plan	Sep. 28, 2012 Facility- And Asset-Related Charges January 2012 Restructuring Plan	Sep. 28, 2012 Facility- And Asset-Related Charges July 2011 Restructuring Plan	Sep. 28, 2012 Facility- And Asset-Related Charges July 2011 Restructuring Plan	Sep. 28, 2012 Facility- And Asset-Related Charges Previous Restructuring Plans	Sep. 28, 2012 Facility- And Asset-Related Charges Previous Restructuring Plans	Mar. 30, 2012 Accelerated amortization of intangible assets	Sep. 28, 2012 Accelerated amortization of intangible assets	Sep. 28, 2012 Accelerated amortization of intangible assets January 2012 Restructuring Plan	Sep. 28, 2012 Other Obligation January 2012 Restructuring Plan	Sep. 28, 2012 Other Obligation July 2011 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected pretax charges																							$ 24					$ 37							$ 48
Expected workforce reductions						500
Restructuring expense	3.3	19.5	110.2	20.5	3.1	108.4					0	1.7					0.1	2.3	14.5	24.4	15.7	2.4	23.7	(0.1)	0.8	(0.1)	0.7	35.8	0.1	0.9	0.2	0.2	47.7	47.7	47.7	1.2
Cumulative pretax restructuring charges incurred to date							4.7	99.8	1.6	2.3		21.4	8.7	7.3	1.7	3.7									15.3					5.5							0.6
Expected total cash payments						$ 31.3						$ 18.5
Expiration year of lease obligations			2017
Expected date of last severance payment			2014