Shares Held in Trust Treated as Treasury Shares - Additional Information (Detail) In Millions, unless otherwise specified		1 Months Ended		12 Months Ended
	Dec. 29, 2012	May 31, 2008 PSU Plan [Member]	Jan. 01, 2011 PSU Plan [Member]	Dec. 29, 2012 2010 Equity Incentive Plan [Member]
Shares Held In Trust Treated As Treasury Shares [Line Items]
Common stock shares issued to trustee		2.3
Common stock shares distributed from trustee share				0.7
Shares held in trust	0		0.6