Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jul. 31, 2011	Jan. 30, 2011
Stockholders' equity
Undesignated preferred stock, par value	$ 0.01	$ 0.01
Undesignated preferred stock, shares authorized	5,000	5,000
Undesignated preferred stock, shares issued
Undesignated preferred stock, shares outstanding
Exchangeable stock, par value
Exchangeable stock, shares authorized	60,000	60,000
Exchangeable stock, shares issued	34,525	35,636
Exchangeable stock, shares outstanding	34,525	35,636
Special voting stock, par value	$ 0.000005	$ 0.000005
Special voting stock, shares authorized	60,000	60,000
Special voting stock, shares issued	34,525	35,636
Special voting stock, shares outstanding	34,525	35,636
Common stock, par value	$ 0.005	$ 0.005
Common stock, shares authorized	400,000	400,000
Common stock, shares issued	108,773	106,756
Common stock, shares outstanding	108,773	106,756