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Investments (Details) (USD $)	6 Months Ended
Investments (Details) (USD $)	Aug. 03, 2013	Jul. 28, 2012	Feb. 02, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 9,844,000
Available-for-sale Securities, Gross Unrealized Gains	1,000
Available-for-sale Securities, Gross Unrealized Losses	15,000
Available-for-sale Securities, Fair Value Disclosure	9,830,000
Short-term investments	5,050,000		0
Payments to Acquire Investments	10,816,000	0
Proceeds from Sale, Maturity and Collection of Investments	950,000	21,403,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0	0
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	5,050,000
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	4,780,000
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	5,052,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	2,000
Available-for-sale Securities, Fair Value Disclosure	5,050,000
Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,792,000
Available-for-sale Securities, Gross Unrealized Gains	1,000
Available-for-sale Securities, Gross Unrealized Losses	13,000
Available-for-sale Securities, Fair Value Disclosure	4,780,000
Certificates of Deposit [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,270,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	2,000
Available-for-sale Securities, Fair Value Disclosure	2,268,000
Commercial Paper [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,374,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value Disclosure	2,374,000
US Government Agencies Debt Securities [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	408,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value Disclosure	408,000
US Government Agencies Debt Securities [Member] \| Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,071,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	2,000
Available-for-sale Securities, Fair Value Disclosure	2,069,000
Municipal Bonds [Member] \| Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	226,000
Available-for-sale Securities, Gross Unrealized Gains	1,000
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value Disclosure	227,000
Corporate Bond Securities [Member] \| Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,495,000
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	11,000
Available-for-sale Securities, Fair Value Disclosure	$ 2,484,000