Fair Value Measurements and Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Feb. 02, 2013	Jan. 28, 2012
Carrying Amount [Member]
Summary of company's financial instruments
Cash and cash equivalents	$ 42,279	$ 157,185
Short-term investments	67,694
Long-term tenant allowance receivables	960	875
Carrying Amount [Member] \| Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	5,612	62,881
Carrying Amount [Member] \| Money Market [Member]
Summary of company's financial instruments
Cash and cash equivalents	36,667	94,304
Carrying Amount [Member] \| Certificates of deposits [Member]
Summary of company's financial instruments
Short-term investments	5,053
Carrying Amount [Member] \| US Treasury Securities [Member]
Summary of company's financial instruments
Short-term investments	19,991
Carrying Amount [Member] \| US Government Securities [Member]
Summary of company's financial instruments
Short-term investments	42,650
Level 1 [Member] \| Fair Value Measurements at Reporting Date [Member] \| Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	5,612	62,881
Level 2 [Member] \| Fair Value Measurements at Reporting Date [Member] \| Money Market [Member]
Summary of company's financial instruments
Cash and cash equivalents	36,667	94,304
Level 2 [Member] \| Fair Value Measurements at Reporting Date [Member] \| Certificates of deposits [Member]
Summary of company's financial instruments
Short-term investments	5,047
Level 2 [Member] \| Fair Value Measurements at Reporting Date [Member] \| US Treasury Securities [Member]
Summary of company's financial instruments
Short-term investments	19,991
Level 2 [Member] \| Fair Value Measurements at Reporting Date [Member] \| US Government Securities [Member]
Summary of company's financial instruments
Short-term investments	42,592
Level 3 [Member] \| Fair Value Measurements at Reporting Date [Member]
Summary of company's financial instruments
Long-term tenant allowance receivables	$ 960	$ 875

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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