Investments (Schedule of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Auction-rate securities [Member]
Available-for-sale Securities [Abstract]
Available-for-Sale Securities, Amortized Cost or Par Value	$ 10,050	$ 10,975
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Losses	(1,196)	(1,331)
Available-for-Sale Securities, Other-than-Temporary Impairment	0	0
Available-for-Sale Securities, Estimated Fair Value	8,854	9,644
State and municipal bonds [Member]
Held-to-maturity Securities [Abstract]
Held-to-Maturity Securities, Amortized Cost or Par Value	47,019	41,192
Held-to-Maturity Securities, Gross Unrealized Gains	232	210
Held-to-Maturity Securities, Gross Unrealized Losses	(5)	(2)
Held-to-Maturity Securities, Other-than-Temporary Impairment	0	0
Held-to-Maturity Securities, Estimated Fair Value	47,246	41,400
Mutual funds [Member]
Trading Securities [Abstract]
Trading Securities, Amortized Cost or Par Value	12,540	11,769
Trading Securities, Gross Unrealized Gains	1,708	1,028
Trading Securities, Gross Unrealized Losses	0	0
Trading Securities, Other-than-Temporary Impairment	0	0
Trading Securities, Estimated Fair Value	$ 14,248	$ 12,797