Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jul. 01, 2012
Supplemental Cash Flow Information [Abstract]
Gross unrealized gains (losses)	$ (1.0)	$ 0.5
Gross unrealized gains (losses), net of taxes	$ (0.6)	$ 0.3
Contractual maturities period of marketable securities, minimum (in months)	1 month
Contractual maturities period of marketable securities, maximum (in months)	35 months

Marketable securities, contractual maturities term, maximum.

No definition available.

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- Definition

Marketable securities, contractual maturities term, minimum.

+ References

No definition available.

+ Details

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- Definition

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

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- Definition

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

+ References

+ Details

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