Restructuring Costs - Restructuring Reserve Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 26, 2014	Jan. 27, 2013	Jan. 29, 2012
Restructuring Reserve [Roll Forward]
Beginning balance				$ 0					$ 0
Restructuring charges	3,086	0	0	0	0	0	0	0	3,086	0	0
Cash payments									(454)
Ending balance	2,632				0				2,632	0
One-time employee termination benefits
Restructuring Reserve [Roll Forward]
Beginning balance				0					0
Restructuring charges									1,841
Cash payments									(454)
Ending balance	1,387								1,387
Contract commitments
Restructuring Reserve [Roll Forward]
Beginning balance				0					0
Restructuring charges									1,245
Ending balance	$ 1,245								$ 1,245