Stockholders' Equity (Roll Forward of Classa Common Shares Outstanding) (Detail)	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Balance at the beginning of the year	52,095,166	55,711,325
Repurchases	(1,073,863)	(3,924,910)
Stock option and ESPP issuances	176,274	453,728
Restricted share issuances	236,576	214,324
Restricted share forfeitures	(113,640)	(14,013)
Shares withheld for tax obligations	(68,129)	(51,944)
Balance at the end of the period	51,252,384	52,388,510