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Note 6. Investments In and Notes Receivable from Privately Held Companies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Nov. 02, 2013
Feb. 02, 2013
Nov. 30, 2010
Issuer B [Member]
Jan. 30, 2010
Issuer B [Member]
Preferred Stock [Member]
Jan. 31, 2009
Issuer B [Member]
Preferred Stock [Member]
Oct. 30, 2010
Issuer C [Member]
Preferred Stock [Member]
Jan. 29, 2011
Issuer D [Member]
Preferred Stock [Member]
Nov. 02, 2013
Issuer E [Member]
Convertible Note Receivalbe [Member]
Jan. 29, 2011
Issuer E [Member]
Convertible Note Receivalbe [Member]
Nov. 02, 2013
Issuer E [Member]
Convertible Note Receivalbe [Member]
Nov. 02, 2013
Issuer F [Member]
Preferred Stock [Member]
Recognized [Member]
Nov. 02, 2013
Issuer F [Member]
Preferred Stock [Member]
Held in Escrow [Member]
Nov. 02, 2013
Issuer F [Member]
Preferred Stock [Member]
Jul. 30, 2011
Issuer F [Member]
Preferred Stock [Member]
Oct. 29, 2011
Issuer G [Member]
Jan. 25, 2012
Issuer H [Member]
Note 6. Investments In and Notes Receivable from Privately Held Companies (Details) [Line Items]                                
Payments to Acquire Investments       $ 1.0 $ 1.0 $ 1.0 $ 1.0   $ 0.3         $ 2.0 $ 0.1  
Other than Temporary Impairment Losses, Investments               0.3   0.3            
Proceeds from Sale of Long-term Investments                     2.1 0.5 2.6      
Gain (Loss) on Sale of Equity Investments 0.1                       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 $ 0.3 $ 3.3