Net Income per Common Share - Additional Information (Detail)	12 Months Ended							12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2011 CAD	Jan. 01, 2011 USD ($)	Jan. 01, 2011 CAD	Dec. 29, 2012 USD ($)	Dec. 29, 2012 CAD	Jan. 02, 2010 USD ($)	Dec. 29, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Jan. 01, 2011 Stock Options [Member]
Earnings Per Share [Line Items]
Outstanding options to purchase common stock	284,000	284,000	704,000	704,000	468,000	468,000	831,000
Weighted average exercise price per share	$ 20.47	20.47	$ 16.67	16.67	$ 7.28	7.28	$ 18.97
Antidilutive securities excluded from computation of diluted net earnings per share								50,000	209,000	354,000
Treasury shares excluded from computation of earnings per share amount	674,397	674,397	1,051,000	1,051,000