Note 6. Investments In and Notes Receivable from Privately Held Companies (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended					1 Months Ended
	May 04, 2013	Feb. 02, 2013	Jan. 30, 2010 Issuer A [Member] Preferred Stock Investments [Member]	Jan. 31, 2009 Issuer A [Member] Preferred Stock Investments [Member]	Nov. 30, 2010 Issuer A [Member]	Oct. 30, 2010 Issuer B [Member] Preferred Stock Investments [Member]	Jan. 29, 2011 Issuer C [Member] Preferred Stock Investments [Member]	Jan. 29, 2011 Issuer D [Member] Convertible Note Receivalbe [Member]	Jul. 30, 2011 Issuer E [Member] Preferred Stock Investments [Member]	Oct. 29, 2011 Issuer F [Member]	Jan. 25, 2012 Issuer G [Member]
Payments to Acquire Investments			$ 1.0	$ 1.0		$ 1.0	$ 1.0	$ 0.3	$ 2.0	$ 0.1
Notes, Loans and Financing Receivable, Gross, Noncurrent					1.0						2.5
Investment Interest Rate					5.00%						3.00%
Debt Instrument, Decrease, Forgiveness											2.5
Notes Receivable, Related Parties	$ 3.0	$ 3.3