Goodwill and Intangible Assets - Schedule of Additions to Finite-Lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 26, 2014	Jan. 27, 2013
Finite-lived Intangible Assets [Roll Forward]
Beginning gross carrying value	$ 228,618	$ 81,030
Purchased intangible assets	833	5,001
Additions to finite-lived intangible assets from acquisitions		135,987
Transfers from in-process research and development	25,100	6,600
Reduction of finite-lived intangible assets	(501)
Finite-lived intangible assets, other change in gross carrying value	(68,053)
Ending gross carrying value	$ 185,997	$ 228,618