Share-Based Compensation (Schedule Of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2011 USD ($) years	Jan. 01, 2011 USD ($) years	Jan. 02, 2010 USD ($) years	Dec. 31, 2011 CAD	Jan. 01, 2011 CAD	Jan. 02, 2010 CAD
Share-Based Compensation [Abstract]
Beginning balance, Shares	704,000	831,000	892,000
Beginning balance, Weighted average exercise price	$ 16.67	$ 18.97	$ 27.52	20.47	16.67	18.97
Beginning balance, Weighted average remaining contractual term (years)	4.2	4.6	3.0
Beginning balance, Aggregate intrinsic value				263,000	625,000	618,100
Stock options granted, Shares		250,000	250,000
Stock options granted, Weighted average exercise price		$ 8.01	$ 1.10
Options exercised, Shares	(275,000)		(25,000)
Options exercised, Weighted average exercise price	$ 1.32		$ 2.60
Options forfeited or expired, Shares	(145,000)	(377,000)	(286,000)
Options forfeited or expired, Weighted average exercise price	$ 38.27	$ 20.33	$ 31.69
Ending balance, Shares	284,000	704,000	831,000
Ending balance, Weighted average exercise price	$ 20.47	$ 16.67	$ 18.97	20.47	16.67	18.97
Ending balance, Weighted average remaining contractual term (years)	1.7	4.2	4.6
Ending balance, Aggregate intrinsic value				263,000	625,000	618,100
Vested at December 31, 2011, Shares	284,000
Vested at December 31, 2011, Weighted average exercise price	$ 20.47
Vested at December 31, 2011, Weighted average remaining contractual term (years)	1.7
Vested at December 31, 2011, Aggregate intrinsic value				263,000
Exercisable at December 31, 2011, Shares	284,000
Exercisable at December 31, 2011, Weighted average exercise price	$ 20.47
Exercisable at December 31, 2011, Weighted average remaining contractual term (years)	1.7
Exercisable at December 31, 2011, Aggregate intrinsic value				263,000