Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands			9 Months Ended
	Aug. 17, 2018	May 02, 2018	Oct. 27, 2019	Oct. 28, 2018
Goodwill [Roll Forward]
Beginning balance			$ 351,141	$ 341,897
Additions			0	13,278
Ending balance			351,141	355,175
Goodwill beginning balance			351,141	341,897
Signal Integrity
Goodwill [Roll Forward]
Beginning balance			274,085	274,085
Additions			0	0
Ending balance			274,085	274,085
Goodwill beginning balance			274,085	274,085
Wireless and Sensing
Goodwill [Roll Forward]
Beginning balance			72,128	67,812
Additions			0	8,500
Ending balance			72,128	76,312
Goodwill beginning balance			72,128	67,812
Protection
Goodwill [Roll Forward]
Beginning balance			4,928	0
Additions			0	4,778
Ending balance			4,928	4,778
Goodwill beginning balance			4,928	$ 0
TrackNet Acquisition
Goodwill [Roll Forward]
Beginning balance			4,300
Goodwill beginning balance			4,300
Purchase price	$ 8,500
IC Interconnect, Inc.
Goodwill [Roll Forward]
Beginning balance			4,900
Additions		$ 4,800
Goodwill beginning balance			$ 4,900
Cash paid to to acquire business		$ 7,400