Consolidated Revenue 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]
Revenue	$ 288.1	$ 316.7	$ 546.0	$ 639.1
Optical segment
Segment Reporting Information [Line Items]
Segment Revenue	122.4	127.5	226.8	248.4
Data segment
Segment Reporting Information [Line Items]
Segment Revenue	77.7	92.2	147.1	203.6
Access segment
Segment Reporting Information [Line Items]
Segment Revenue	37.3	39.8	73.2	79.9
Services segment
Segment Reporting Information [Line Items]
Segment Revenue	$ 50.7	$ 57.2	$ 98.9	$ 107.2

Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 22

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a, b, c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration