Segment Profit and Reconciliation to Operating Loss by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Segment Reporting Information [Line Items]
Total segment profit	$ 57.6	$ 36.0	$ 89.0	$ 81.7
Sales and marketing expenses	(32.2)	(40.8)	(68.6)	(85.5)
General and administrative expenses	(19.7)	(21.0)	(40.8)	(44.7)
Equity-based compensation	(2.2)	(4.3)	(4.8)	(8.0)
Intangible asset amortization	(1.0)	(5.1)	(3.2)	(10.3)
Restructuring and other charges	(0.9)		(106.9)	(1.0)
Operating Earnings (Loss)	1.6	(35.2)	(135.3)	(67.8)
Optical segment
Segment Reporting Information [Line Items]
Total segment profit	29.0	21.1	43.8	46.5
Data segment
Segment Reporting Information [Line Items]
Total segment profit	5.4	(15.0)	0.4	(15.8)
Access segment
Segment Reporting Information [Line Items]
Total segment profit	6.0	8.3	12.4	19.4
Services segment
Segment Reporting Information [Line Items]
Total segment profit	$ 17.2	$ 21.6	$ 32.4	$ 31.6