Fair Value Measurements (Details) (Recurring basis, Money market fund, USD $) In Thousands, unless otherwise specified	Jul. 28, 2012	Jan. 28, 2012	Jul. 30, 2011
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market fund	$ 10,252	$ 25,231	$ 20,208
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market fund	0	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market fund	0	0	0
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market fund	$ 10,252	$ 25,231	$ 20,208