Significant Accounting Policies - Computation of Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 13,118	$ 16,590	$ 10,022	$ 2,209	$ 12,388	$ 26,979	$ 27,138	$ 22,582	$ 41,939	$ 89,087	$ 72,572
Weighted average common shares outstanding - basic	66,371	65,996	65,587	65,282	64,856	65,440	65,547	64,552	65,809	65,099	62,339
Dilutive effect of employee equity incentive plans									1,663	2,251	2,184
Weighted average common shares outstanding - diluted	67,984	67,465	67,165	67,233	66,776	67,314	68,186	67,123	67,472	67,350	64,523
Basic earnings per common share (in dollars per share)	$ 0.20	$ 0.25	$ 0.15	$ 0.03	$ 0.19	$ 0.41	$ 0.41	$ 0.35	$ 0.64	$ 1.37	$ 1.16
Diluted earnings per common share (in dollars per share)	$ 0.19	$ 0.25	$ 0.15	$ 0.03	$ 0.19	$ 0.40	$ 0.40	$ 0.34	$ 0.62	$ 1.32	$ 1.12
Anti-dilutive shares not included in the above calculations									783	625	1,700