Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Oct. 30, 2011	Oct. 31, 2010	Oct. 30, 2011	Oct. 31, 2010	Jan. 30, 2011
Revenue by Operating Segment and Geographic Region
Revenue	$ 1,066,180	$ 843,912	$ 3,044,736	$ 2,656,933
Depreciation and amortization expense	52,387	46,786	152,310	140,596
Operating income (loss)	197,090	103,783	525,982	75,969
Percentage of revenue from significant customers (in hundredths)	0.11	0.12	0.11	0.13
Number of customers with significant revenue	1	1	1	1
Percentage of accounts receivable from significant customers (in hundredths)	0.18		0.18		0.11
Number of customers with significant accounts receivable balance			1		1
GPU [Member]
Revenue by Operating Segment and Geographic Region
Revenue	644,802	581,863	1,920,935	1,913,130
Depreciation and amortization expense	29,547	31,488	89,238	97,180
Operating income (loss)	146,843	48,521	406,833	(57,846)
PSB [Member]
Revenue by Operating Segment and Geographic Region
Revenue	230,295	210,115	642,425	614,935
Depreciation and amortization expense	5,427	7,782	17,414	20,379
Operating income (loss)	95,887	87,027	235,635	246,117
CPB [Member]
Revenue by Operating Segment and Geographic Region
Revenue	191,083	51,934	481,376	128,868
Depreciation and amortization expense	17,413	7,516	45,658	23,037
Operating income (loss)	(45,640)	(31,765)	(116,486)	(112,302)
All Other [Member]
Revenue by Operating Segment and Geographic Region
Revenue	0	0	0	0
Depreciation and amortization expense	0	0	0	0
Operating income (loss)	0	0	0	0
China [Member]
Revenue by Operating Segment and Geographic Region
Revenue	209,986	282,300	732,202	930,981
Taiwan [Member]
Revenue by Operating Segment and Geographic Region
Revenue	293,171	220,322	857,717	687,474
Other Asia Pacific [Member]
Revenue by Operating Segment and Geographic Region
Revenue	223,597	112,292	561,708	395,091
United States [Member]
Revenue by Operating Segment and Geographic Region
Revenue	180,245	79,474	442,733	227,633
Other Americas [Member]
Revenue by Operating Segment and Geographic Region
Revenue	84,868	78,737	228,223	216,419
Europe [Member]
Revenue by Operating Segment and Geographic Region
Revenue	$ 74,313	$ 70,787	$ 222,153	$ 199,335

Total number of customers with individual accounts receivable balances representing 10 percent or more of total accounts receivable.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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