Computation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 29, 2013	Sep. 30, 2013	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014 Convertible Notes	Sep. 29, 2013 Convertible Notes	Sep. 28, 2014 Convertible Notes Hedge Warrant	Sep. 28, 2014 Convertible Notes Hedge Warrant	Sep. 30, 2013 Convertible Notes Hedge Warrant
Net Income Loss Per Common Share
Initial debt conversion price					$ 5.4750	$ 5.4800			$ 7.67
Shares that would be issued upon conversion	34.7	34.7	34.7	34.7
Initial debt conversion price							$ 7.63	$ 7.64