Common Stock Repurchases - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Date the Company's board of directors authorized a stock repurchase program			Mar. 09, 2011
Maximum amount authorized under stock repurchase program			$ 750.0
Value of shares remaining under stock repurchase program			525.0
Repurchase of shares, shares	6.6	11.2	29.1	67.5
Repurchase of shares, value	50.1	75.0	226.2	471.8
Date the Company's board of directors authorized an additional stock repurchase program	August 1, 2012		August 1, 2012
Additional repurchase of common stock, authorized amount			$ 500.0