Guarantees (Details) (USD $)	3 Months Ended				9 Months Ended
	Oct. 28, 2012		Oct. 30, 2011		Oct. 28, 2012	Oct. 30, 2011
Estimated product warranty liabilities
Balance at beginning of period (1)	$ 16,537,000	[1]	$ 53,818,000	[1]	$ 18,406,000	$ 107,896,000
Additions	1,358,000		2,010,000		4,715,000	4,994,000
Deductions (2)	(2,848,000)	[2]	(12,119,000)	[2]	(8,074,000)	(69,181,000)
Balance at end of period	15,047,000		43,709,000		15,047,000	43,709,000
Incremental repair and replacement costs for the weak die/packaging material set	10,900,000		49,400,000		13,200,000	103,700,000
Payments related to warranty accrual	$ 1,100,000		$ 8,200,000		$ 3,000,000	$ 48,400,000

[1] Includes $10.9 million and $13.2 million for the three and nine months ended October 28, 2012, respectively, and $49.4 million and $103.7 million for the three and nine months ended October 30, 2011, respectively, related to warranty accrual associated with incremental repair and replacement costs from a weak die/packaging material set.

[2] Includes $1.1 million and $3.0 million for the three and nine months ended October 28, 2012, respectively, and $8.2 million and $48.4 million for the three and nine months ended October 30, 2011, respectively, in payments related to the warranty accrual associated with incremental repair and replacement costs from a weak die/packaging material set.