Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) $ in Thousands	9 Months Ended
	Oct. 29, 2017 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 329,703
Additions (1)	12,187	[1]
Ending balance	341,890
Signal Integrity [Member]
Goodwill [Roll Forward]
Beginning balance	261,891
Additions (1)	12,187	[1]
Ending balance	274,078
Power and High Reliability [Member]
Goodwill [Roll Forward]
Beginning balance	49,384
Additions (1)	0	[1]
Ending balance	49,384
Wireless and Sensing [Member]
Goodwill [Roll Forward]
Beginning balance	18,428
Additions (1)	0	[1]
Ending balance	$ 18,428

[1] Composed of goodwill recognized on the acquisition date and subsequent adjustments resulting from changes to the acquisition date fair values of net assets acquired in the business combination recorded during their respective measurement periods.