Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 28, 2019	Jul. 28, 2019	Jan. 27, 2019
Commitments and Contingencies [Line Items]
Restructuring expense	$ 2,000	$ 2,100
Earn-out liability recorded	4,829	4,829	$ 6,675
Amount expected to be settled within twelve months	4,829	4,829
Cycleo
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	11,300	11,300
Earn-out liability recorded	4,829	4,829	4,514
Amount expected to be settled within twelve months	4,829	4,829
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	2,200	2,200
Payment towards remediation plan		3,700
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	$ 22,700	$ 22,700	$ 20,400