Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 27, 2019	Oct. 28, 2018	Oct. 27, 2019	Oct. 28, 2018	Jan. 27, 2019
Commitments and Contingencies [Line Items]
Restructuring expense	$ 0	$ 0	$ 2,100	$ 400
Earn-out liability recorded	2,232		2,232		$ 6,675
Amount expected to be settled within twelve months	2,232		2,232
Cycleo
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	11,300		11,300
Payments related to earn out	7,700		7,700
Earn-out liability recorded	2,232		2,232		4,514
Amount expected to be settled within twelve months	2,232		2,232
AptoVision
Commitments and Contingencies [Line Items]
Earn-out liability recorded	0		0		2,161
Amount expected to be settled within twelve months	0		0
Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	1,600		1,600
Payment towards remediation plan	4,300		4,300
Minimum | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	5,900		5,900
Maximum | AptoVision
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	35,300		35,300
Maximum | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	7,500		7,500
Other Assets
Commitments and Contingencies [Line Items]
Cash surrender value of life insurance	$ 22,500		$ 22,500		$ 20,400