Quartely Summary (Details) (USD $)	3 Months Ended								12 Months Ended
	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	Oct. 31, 2010	Jul. 31, 2010	May 02, 2010	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010
Selected Quarterly Financial Information [Abstract]
Revenue	$ 953,194,000	$ 1,066,180,000	$ 1,016,517,000	$ 962,039,000	$ 886,376,000	$ 843,912,000	$ 811,208,000	$ 1,001,813,000	$ 3,997,930,000	$ 3,543,309,000	$ 3,326,445,000
Cost of revenue	463,181,000	509,463,000	491,233,000	477,536,000	460,017,000	451,850,000	676,916,000	545,436,000	1,941,413,000	2,134,219,000	2,149,522,000
Gross profit	490,013,000	556,717,000	525,284,000	484,503,000	426,359,000	392,062,000	134,292,000	456,377,000	2,056,517,000	1,409,090,000	1,176,923,000
Net income (loss)	116,025,000	178,273,000	151,573,000	135,219,000	171,651,000	84,862,000	(140,961,000)	137,594,000	581,090,000	253,146,000	(67,987,000)
Basic net income (loss) per share	$ 0.19	$ 0.29	$ 0.25	$ 0.23	$ 0.29	$ 0.15	$ (0.25)	$ 0.24	$ 0.96	$ 0.44	$ (0.12)
Diluted net income (loss) per share	$ 0.19	$ 0.29	$ 0.25	$ 0.22	$ 0.29	$ 0.15	$ (0.25)	$ 0.23	$ 0.94	$ 0.43	$ (0.12)
Business Combination, Acquisition Related Costs	5,100,000	6,400,000	7,600,000	1,300,000
Litigation Settlement										57,000,000
Patent Cross Licensing Agreement Term										6
Insurance Recoveries						13,400,000
Insurance Settlement Benefit Allocation To Cost Of Sale							11,100,000
Insurance Settlement Benefit Allocation To Legal Expense							2,300,000
Warranty Charge Against Cost Of Revenue							192,300,000
Litigation Settlement, Expense	$ 7,300,000						$ 15,000,000