Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jul. 27, 2014	Apr. 27, 2014	Jul. 28, 2013	Jul. 27, 2014	Jul. 28, 2013
Restructuring Reserve [Roll Forward]
Balance at January 26, 2014		$ 2,632		$ 2,632
Charges	0	1,001	0	1,001	0
Cash payments				(3,288)
Reclassifications				(115)
Balance at July 27, 2014	230			230
One-time employee termination benefits [Member]
Restructuring Reserve [Roll Forward]
Balance at January 26, 2014		1,387		1,387
Charges				378
Cash payments				(1,702)
Reclassifications				0
Balance at July 27, 2014	63			63
Contract commitments [Member]
Restructuring Reserve [Roll Forward]
Balance at January 26, 2014		1,245		1,245
Charges				623
Cash payments				(1,586)
Reclassifications				(115)
Balance at July 27, 2014	$ 167			$ 167