Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 28, 2012	Jan. 28, 2012	Apr. 30, 2011
Balance Sheets [Abstract]
Common Stock, Par Value	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized	400,000	400,000	400,000
Common Stock, Shares Issued	63,438	62,764	61,577
Common Stock, Shares Outstanding	62,883	60,209	61,072