Corporate Reorganization Expenses - Additional Information (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]
Restructuring accruals	7,473		13,230
Corporate reorganization expenses	9,475	0	18,874
Accounts Payable
Corporate Reorganization Costs And Reserve [Line Items]
Restructuring accruals	6,200
Retention Agreement
Corporate Reorganization Costs And Reserve [Line Items]
Restructuring accruals	800
Retention Agreement | Maximum
Corporate Reorganization Costs And Reserve [Line Items]
Corporate reorganization expenses	2,800