Corporate Reorganization Expenses (Detail) (CAD) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 30, 2012
Corporate Reorganization Costs And Reserve [Line Items]
Corporate reorganization expenses	9,475	0	18,874
Termination Costs
Corporate Reorganization Costs And Reserve [Line Items]
Corporate reorganization expenses	6,632		9,016
Professional Fees and Other
Corporate Reorganization Costs And Reserve [Line Items]
Corporate reorganization expenses	2,543		7,602
Transition Cost
Corporate Reorganization Costs And Reserve [Line Items]
Corporate reorganization expenses	300		2,256