Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017	Jul. 01, 2017	Mar. 07, 2012
Loss Contingencies [Line Items]
Rent expense	$ 6,300	$ 5,900	$ 6,700
Sublease income	138	$ 141	131
Net periodic pension expense	400
Description of prior year immaterial error corrected in fiscal year 2017		Although the Swiss Plan originated in prior years, the Company accounted for the Swiss Plan in accordance with ASC 715-30 Defined Benefit Plans - Pensions starting in 2017. The Company evaluated the impact of not recording the net pension obligation in the Balance Sheets and corresponding charges in net income and total comprehensive income in the Statements of Income and Statements of Comprehensive Income in the historical periods presented, and concluded that the effect was immaterial. The Company corrected the immaterial error in fiscal year 2017 by recording an out of period expense, computed as of February 1, 2016, resulting in a decrease of $1.4 million in net income, an increase in the pension obligation of $5.8 million, an increase in deferred income tax assets of $1.3 million, and a decrease to accumulated other comprehensive income of $3.1 million.
Deferred compensation expense (benefit), net of forfeitures	1,300	$ 6,000	4,300
Earn-out liability	6,675	26,520
Earn-out liability expected to be paid within twelve months	3,276
Cycleo
Loss Contingencies [Line Items]
Earn-out liability	4,514	5,520
Earn-out liability expected to be paid within twelve months	1,978
Potential payments under earn-out arrangements, high estimate					$ 14,600
AptoVision
Loss Contingencies [Line Items]
Earn-out liability	2,161	21,000
Earn-out liability expected to be paid within twelve months	1,298
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] | AptoVision
Loss Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate				$ 47,000
Net Income Correction
Loss Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		1,400
Pension Obligation Correction
Loss Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		5,800
Deferred Income Tax Assets Correction
Loss Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		1,300
Accumulated Other Comprehensive Income Correction
Loss Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		3,100
United States | Defined Contribution Plan [Member]
Loss Contingencies [Line Items]
Employer contribution to defined contribution plan	1,000	1,300	1,200
Foreign Plan [Member] | Pension Plan [Member]
Loss Contingencies [Line Items]
Unfunded net pension obligation	6,400
Pension plan assets	25,700
Projected benefit obligation of pension plan	32,100
Contributions made by the Company	900
Foreign Plan [Member] | Defined Contribution Plan [Member]
Loss Contingencies [Line Items]
Employer contribution to defined contribution plan	600	800	$ 1,000
Environmental Issue
Loss Contingencies [Line Items]
Payment towards remediation plan	3,400
Loss contingency accrual	1,900
Environmental Issue | Minimum
Loss Contingencies [Line Items]
Estimate of probable loss	5,300
Environmental Issue | Maximum
Loss Contingencies [Line Items]
Estimate of probable loss	7,500
Other assets
Loss Contingencies [Line Items]
Cash surrender value of life insurance	$ 20,400	$ 22,300