Stock Repurchase Program And Shares Withheld From Vested Restricted Shares - (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Equity, Class of Treasury Stock [Line Items]
Repurchases, shares	1,578,869	1,034,491	273,139
Repurchases, value	$ 40,906	$ 30,000	$ 7,769
Shares repurchased under the 2011 program
Equity, Class of Treasury Stock [Line Items]
Repurchases, shares	1,578,869	1,034,491	263,443
Repurchases, value	40,906	30,000	7,500
Shares withheld from vested restricted shares
Equity, Class of Treasury Stock [Line Items]
Repurchases, shares	0	0	9,696
Repurchases, value	$ 0	$ 0	$ 269