Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 40,748	$ 32,280	$ 100,215	$ 84,386
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	12	0	12	0
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements	(290)	0	(290)	0
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	290		290
Defined benefit pension plan:
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	175	24	525	72
Other comprehensive income, before tax	477	24	827	72
Income tax expense/(benefit) on other comprehensive income items	170	7	325	(22)
Other comprehensive income, net of tax	307	17	502	94
Comprehensive income	$ 41,055	$ 32,297	$ 100,717	$ 84,480