Fair Value (unobservable Inputs Table) (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended				6 Months Ended
	Jul. 28, 2012	Jan. 28, 2012	Jul. 28, 2012 Student Loan Auction Rate Securities [Member] Discounted Cash Flow [Member] y	Jul. 28, 2012 Student Loan Auction Rate Securities [Member] Maximum [Member] Discounted Cash Flow [Member]	Jul. 28, 2012 Student Loan Auction Rate Securities [Member] Minimum [Member] Discounted Cash Flow [Member]	Jul. 28, 2012 Muncipal Authority Auction Rate Securities [Member] Discounted Cash Flow [Member]	Jul. 28, 2012 Muncipal Authority Auction Rate Securities [Member] Maximum [Member] y	Jul. 28, 2012 Muncipal Authority Auction Rate Securities [Member] Minimum [Member] y
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 20,110	$ 99,508	$ 4,787			$ 15,323
Periodic Coupon Rate				3.27%	0.50%		4.33%	0.32%
Market Rate of Return				2.05%	0.25%		3.83%	0.03%
Expectged Term			19.3				27.30	21.80