Fair Value Measurements and Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Nov. 02, 2013	Feb. 02, 2013	Oct. 27, 2012
Carrying Amount [Member]
Summary of company's financial instruments
Cash and cash equivalents	$ 30,084	$ 42,279	$ 126,343
Short-term investments	35,812	67,694
Tenant allowances receivable	1,029
Long-term tenant allowances receivable		960	938
Carrying Amount [Member] | Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	16,098	5,612	21,992
Carrying Amount [Member] | Money Market Funds [Member]
Summary of company's financial instruments
Cash and cash equivalents	13,986	36,667	104,351
Carrying Amount [Member] | Certificates of Deposit [Member]
Summary of company's financial instruments
Short-term investments	5,490	5,053
Carrying Amount [Member] | US Treasury Securities [Member]
Summary of company's financial instruments
Short-term investments	4,994	19,991
Carrying Amount [Member] | US Government Securities [Member]
Summary of company's financial instruments
Short-term investments	25,328	42,650
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member]
Summary of company's financial instruments
Short-term investments		0
Long-term tenant allowances receivable	0	0	0
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member] | Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	16,098	5,612	21,992
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member] | Money Market Funds [Member]
Summary of company's financial instruments
Cash and cash equivalents	0	0	0
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member] | Certificates of Deposit [Member]
Summary of company's financial instruments
Short-term investments	0	0
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member] | US Treasury Securities [Member]
Summary of company's financial instruments
Short-term investments	0	0
Level 1 [Member] | Fair Value Measurements at Reporting Date [Member] | US Government Securities [Member]
Summary of company's financial instruments
Short-term investments	0	0
Level 2 [Member] | Fair Value Measurements at Reporting Date [Member]
Summary of company's financial instruments
Short-term investments		0
Long-term tenant allowances receivable	0	0	0
Level 2 [Member] | Fair Value Measurements at Reporting Date [Member] | Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	0	0	0
Level 2 [Member] | Fair Value Measurements at Reporting Date [Member] | Money Market Funds [Member]
Summary of company's financial instruments
Cash and cash equivalents	13,986	36,667	104,351
Level 2 [Member] | Fair Value Measurements at Reporting Date [Member] | Certificates of Deposit [Member]
Summary of company's financial instruments
Short-term investments	5,476	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	5,000	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	25,303	42,592
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member]
Summary of company's financial instruments
Short-term investments		0
Tenant allowances receivable	1,029
Long-term tenant allowances receivable		960	938
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member] | Cash [Member]
Summary of company's financial instruments
Cash and cash equivalents	0	0	0
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member] | Money Market Funds [Member]
Summary of company's financial instruments
Cash and cash equivalents	0	0	0
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member] | Certificates of Deposit [Member]
Summary of company's financial instruments
Short-term investments	0	0
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member] | US Treasury Securities [Member]
Summary of company's financial instruments
Short-term investments	0	0
Level 3 [Member] | Fair Value Measurements at Reporting Date [Member] | US Government Securities [Member]
Summary of company's financial instruments
Short-term investments	$ 0	$ 0