Stockholders' Equity (Details) In Thousands	6 Months Ended
	Jul. 31, 2011	Jun. 08, 2011	May 01, 2011	Jan. 30, 2011
Stockholders Equity (Textuals) [Abstract]
Stock Split	two-for-one stock split
Common Stock, Shares Authorized	400,000	400,000	200,000	400,000
Exchangeable stock, shares authorized	60,000	60,000	30,000	60,000