Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 30, 2011	Jan. 29, 2011
Preferred shares, par value	$ 0	$ 0
Preferred shares, shares authorized	10,000,000	10,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common shares, par value	$ 0	$ 0
Common shares, shares authorized	150,000,000	150,000,000
Common shares, shares issued	44,870,286	44,629,656
Common shares, shares outstanding	44,870,286	44,629,656