Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 27, 2014	Jul. 28, 2013	Jul. 27, 2014	Jul. 28, 2013
Income Taxes
Income tax expense	$ 26,649	$ 15,372	$ 53,415	$ 25,543
Effective Income Tax Rate, Continuing Operations	17.20%	13.80%	16.80%	12.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			35.00%
Annual projected effective tax rate as of the first three months of fiscal year 2015			19.10%