CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)	Jul. 30, 2011	Jan. 29, 2011
Stockholder's Equity
Preferred Shares, no par value (in dollars per share)	$ 0	$ 0
Preferred Shares, authorized (in shares)	100,000,000	0
Preferred Shares, issued (in shares)	0	0
Preferred Shares, outstanding (in shares)	0	0
Class A [Member]
Stockholder's Equity
Common Shares, no par value (in dollars per share)	$ 0	$ 0
Common Shares, authorized (in shares)	170,000,000	69,600,000
Common Shares, issued (in shares)	28,109,968	21,872,844
Common Shares, outstanding (in shares)	28,109,968	21,872,844
Common Shares, no par value (in dollars per share)	$ 0	$ 0
Common Shares, authorized (in shares)	170,000,000	69,600,000
Common Shares, issued (in shares)	28,109,968	21,872,844
Common Shares, outstanding (in shares)	28,109,968	21,872,844
Class B [Member]
Stockholder's Equity
Common Shares, no par value (in dollars per share)	$ 0	$ 0
Common Shares, authorized (in shares)	100,000,000	0
Common Shares, issued (in shares)	11,171,544	0
Common Shares, outstanding (in shares)	11,171,544	0
Common Shares, no par value (in dollars per share)	$ 0	$ 0
Common Shares, authorized (in shares)	100,000,000	0
Common Shares, issued (in shares)	11,171,544	0
Common Shares, outstanding (in shares)	11,171,544	0