Note 18. Income taxes (Detail) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended					12 Months Ended
	Oct. 27, 2012 USD ($)	Feb. 02, 2013 USD ($)	Jan. 28, 2012 USD ($)	Feb. 02, 2013 DKK	Feb. 02, 2013 Domestic Tax Authority [Member] USD ($)	Feb. 02, 2013 State and Local Jurisdiction [Member] USD ($)	Jan. 28, 2012 Singapore [Member] USD ($)	Jan. 29, 2011 Singapore [Member] USD ($)	Jan. 30, 2010 Singapore [Member] USD ($)	Jan. 31, 2009 Singapore [Member] USD ($)	Feb. 02, 2013 Israel [Member] USD ($)	Jan. 28, 2012 Israel [Member] USD ($)	Jan. 29, 2011 Israel [Member] USD ($)	Feb. 02, 2013 Additional Paid-in Capital [Member] USD ($)
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 16.7
Valuation Allowances and Reserves, Period Increase (Decrease)		16.2
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		33.9												25.5
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		25.4												3.4
Deferred Tax Assets, Tax Credit Carryforwards, Research					15.7	15.7
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		29.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		17.7
Unrecognized Tax Benefits, Period Increase (Decrease)		4.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		0.3	0.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		1.0	0.7
Settlement to Reduce Net Operating Losses (in Kroner)				75
Undistributed Earnings of Foreign Subsidiaries		6.7
Income Tax Holiday, Aggregate Dollar Amount							$ 2.0	$ 6.7	$ 7.0	$ 6.5	$ 3.4	$ 2.0	$ 6.2
Income Tax Holiday, Income Tax Benefits Per Share (in Dollars per share)							$ 0.06	$ 0.21	$ 0.25	$ 0.23	$ 0.10	$ 0.06	$ 0.20
Number of Years Exempt From Tax on Income											2 years
Number of Years Suject to Reduced Corporate Tax Rate											8 years