Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	9 Months Ended
	Oct. 27, 2012 Rate	Oct. 29, 2011 Rate	Jul. 28, 2012 Rate	Oct. 27, 2012 Rate	Oct. 29, 2011 Rate
Asset Impairment Charges [Abstract]
Impairment of goodwill and long-lived assets	$ 810,996	$ 0		$ 810,996	$ 0
Effective Income Tax Rate [Line Items]
Effective Income Tax Rate, Continuing Operations	(42.90%)	33.50%	32.50%	443.60%	32.00%
Valuation Allowances and Reserves, Charged to Cost and Expense	21,541			21,541
Restructuring Charges [Abstract]
Restructuring charges	$ 30,396	$ 0		$ 30,396	$ 0