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Shareholders' Equity (Narrative) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	9 Months Ended
	Oct. 31, 2011	Sep. 28, 2012	Sep. 30, 2011
Stockholders Equity [Line Items]
Stock repurchase program, remaining authorized repurchase fund	$ 100.0
Stock repurchased during period, shares		0	0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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