Segment Information (Detail)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Number of Reportable Segments	3
Number of Stores Sold	2	4
Number of Stores Closed		2
Military [Member]
Number of Distribution Centre	8
Food Distribution [Member]
Number of Distribution Centre	13
Retail [Member]
Number of Distribution Centre	75
No Frills Supermarket [Member]
Number of Acquisition Unit	18
Bag 'N Save Supermarkets [Member]
Number of Acquisition Unit	12
Additional Supermarket [Member]
Number of Acquisition Unit	1