Note 6. Investments In and Notes Receivable from Privately Held Companies (Detail) (USD $)	1 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended	1 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			1 Months Ended
	Jul. 31, 2010	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011	Jan. 31, 2009 Issuer A [Member] Preferred Stock Investments [Member]	Jan. 31, 2009 Issuer A [Member] Convertible Note Receivalbe [Member]	Jan. 30, 2010 Issuer B [Member] Preferred Stock Investments [Member]	Jan. 31, 2009 Issuer B [Member] Preferred Stock Investments [Member]	Nov. 30, 2010 Issuer B [Member]	Feb. 02, 2013 Issuer B [Member]	Jan. 28, 2012 Issuer B [Member]	Oct. 30, 2010 Issuer C [Member] Preferred Stock Investments [Member]	Feb. 02, 2013 Issuer C [Member]	Jan. 28, 2012 Issuer C [Member]	Jan. 29, 2011 Issuer D [Member] Preferred Stock Investments [Member]	Feb. 02, 2013 Issuer D [Member]	Jan. 28, 2012 Issuer D [Member]	Jan. 29, 2011 Issuer E [Member] Convertible Note Receivalbe [Member]	Feb. 02, 2013 Issuer E [Member]	Jan. 28, 2012 Issuer E [Member]	Jul. 30, 2011 Issuer F [Member] Preferred Stock Investments [Member]	Feb. 02, 2013 Issuer F [Member]	Jan. 28, 2012 Issuer F [Member]	Oct. 29, 2011 Issuer G [Member]	Feb. 02, 2013 Issuer G [Member]	Jan. 28, 2012 Issuer G [Member]	Jan. 25, 2012 Issuer H [Member]	Feb. 02, 2013 Equity Securities [Member]	Jan. 28, 2012 Equity Securities [Member]
Payments to Acquire Investments			$ 2,142,000	$ 2,300,000	$ 2,000,000		$ 1,000,000	$ 1,000,000				$ 1,000,000			$ 1,000,000			$ 300,000			$ 2,000,000			$ 100,000
Payments to Acquire Notes Receivable			2,500,000	1,150,000		3,000,000
Investment Interest Rate						9.00%			5.00%																		3.00%
Asset Impairment Charges	5,200,000	1,100,000
Long-term Investments		6,443,000	6,443,000							2,000,000	2,000,000		1,000,000	1,000,000		1,000,000	1,000,000		300,000	300,000		2,000,000	2,000,000		143,000	143,000		6,400,000	6,400,000
Notes, Loans and Financing Receivable, Gross, Noncurrent									1,000,000																		2,500,000
Acquisition Cost of All Outstanding Securities, per Agreement, if Exercise the Right																											11,200,000
Debt Instrument, Decrease, Forgiveness																											2,500,000
Notes Receivable, Related Parties		3,300,000	3,500,000
Cost Method Investments										$ 5,000,000