Fair Value (Unobservable Inputs Table) (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended				9 Months Ended
	Oct. 27, 2012	Jan. 28, 2012	Oct. 27, 2012 Student Loan Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member] Y	Oct. 27, 2012 Student Loan Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member] Minimum [Member]	Oct. 27, 2012 Student Loan Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member] Maximum [Member]	Oct. 27, 2012 Muncipal Authority Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member]	Oct. 27, 2012 Muncipal Authority Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member] Minimum [Member] Y	Oct. 27, 2012 Muncipal Authority Auction Rate Securities [Member] Discounted Cash Flow [Member] Level 3 [Member] Maximum [Member] Y
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 19,903	$ 99,508	$ 4,755			$ 15,148
Periodic coupon rate				0.51%	3.79%		0.30%	6.90%
Market rate of return				0.21%	2.34%		0.00%	4.04%
Expected term (in years)			15				21.5	27.0