Goodwill and Intangible Assets (Future Amortization Expense For Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 29, 2012
Remainder of fiscal year 2013	$ 16,359
Fiscal year 2014	28,595
Fiscal year 2015	27,949
Fiscal year 2016	27,403
Fiscal year 2017	27,066
Thereafter	52,242
Total expected amortization expense	179,614
Technology Licenses [Member]
Remainder of fiscal year 2013	300
Fiscal year 2014	600
Fiscal year 2015	600
Fiscal year 2016	600
Fiscal year 2017	350
Thereafter	0
Total expected amortization expense	2,450
Sierra Monolithics [Member]
Remainder of fiscal year 2013	4,105
Fiscal year 2014	8,210
Fiscal year 2015	8,210
Fiscal year 2016	8,210
Fiscal year 2017	8,210
Thereafter	13,020
Total expected amortization expense	49,965
Gennum [Member]
Remainder of fiscal year 2013	11,416
Fiscal year 2014	18,778
Fiscal year 2015	18,132
Fiscal year 2016	17,586
Fiscal year 2017	17,499
Thereafter	38,133
Total expected amortization expense	121,544
Cycleo [Member]
Remainder of fiscal year 2013	538
Fiscal year 2014	1,007
Fiscal year 2015	1,007
Fiscal year 2016	1,007
Fiscal year 2017	1,007
Thereafter	1,089
Total expected amortization expense	$ 5,655