Income Taxes (Components Of Deferred Income Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 29, 2012	Jan. 30, 2011
Income Taxes [Line Items]
Current deferred tax asset, Valuation reserve	$ (552)
Deferred tax assets - Current	5,340	16,400
Non-current deferred tax asset, Valuation reserve	(5,065)	(5,053)
Deferred tax assets - Non-current	42,615	30,160
Total deferred tax liability	(47,657)	(47,645)
Net deferred tax (liability) asset	298	(1,085)
Current [Member]
Income Taxes [Line Items]
Deferred revenue, Current	2,346	2,866
Inventory reserve, Current	347	928
Payroll and related	1,926	3,587
Current deferred tax asset, Bad debt reserve	359	611
Current deferred tax asset, Accrued service fees	405	7,746
Other deferred assets	509	662
Current deferred tax liability, Depreciation - Foreign	(1,074)	(528)
Other deferred tax liability	(181)	(144)
Non-current [Member]
Income Taxes [Line Items]
Payroll and related	4,497	4,117
Other deferred assets	772	2,291
Non-current deferred tax asset, Research and development charges	3,707	5,360
Non-current deferred tax asset, Research credit carryforward	11,967	8,353
Non-current deferred tax asset, Acquired NOL carryforward	16,489	3,043
Non-current deferred tax asset, Stock-based compensation	10,248	12,049
Non-current deferred tax liability, Domestic tax on foreign earnings	(23,443)	(23,443)
Non-current deferred tax liability, Purchase accounting deferred tax liability	(14,159)	(17,166)
Non-current deferred tax liability, Depreciation and amortization	(5,760)	(2,638)
Other deferred tax liability	(254)	(1,064)
Current-Foreign [Member]
Income Taxes [Line Items]
Current deferred tax liability, Inventory reserve - Foreign	(2,115)	(2,023)
Current deferred tax liability, Bad debt reserve - Foreign	$ (671)	$ (639)