Investments (Par Value) (Details) (Auction-rate securities [Member], USD $) In Thousands, unless otherwise specified			9 Months Ended
	Nov. 01, 2014	Feb. 01, 2014	Nov. 01, 2014 Municipal revenue bonds [Member]	Nov. 01, 2014 Municipal bond funds [Member]	Nov. 01, 2014 Student loan bonds [Member]
Investment Holdings [Line Items]
Underlying Collateral			100% insured by AAA/AA/A-rated bond insurers	Fixed income instruments within issuers' money market funds	Student loans guaranteed by state entities
Available-for-sale securities, par value	$ 10,050	$ 10,975	$ 7,050	$ 50	$ 2,950
Percentage of bond insured by AAA/AA/A-rated bond insurers (percent)			100.00%