Comprehensive Income (Loss) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Notes to financial statements [Abstract]
Net income (loss)	$ 151,573	$ (140,961)	$ 286,792	$ (3,367)
Net change in unrealized gain (loss) on available-for-sale securities, net of tax	3,520	840	4,423	(244)
Reclassification adjustments for net realized gains (losses) on available-for-sale securities included in net income (loss) net of tax	(207)	(478)	(261)	(692)
Total comprehensive income (loss)	$ 154,886	$ (140,599)	$ 290,954	$ (4,303)

The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain or loss, net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain or loss at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains or losses realized upon the sale of securities, after tax; and (3) the unrealized gains or losses realized upon the write-down of securities, after tax.

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