Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Aug. 01, 2018	Jul. 01, 2017	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018	Mar. 07, 2012
Loss Contingencies [Line Items]
Rent expense			$ 6,500	$ 6,300	$ 5,900
Litigation settlement, amount awarded from other party	$ 9,000
Sublease income			130	$ 138	141
Net periodic pension expense			2,400
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			6,800	$ 1,300	6,000
Earn-out liability			2,108	6,675
Earn-out liability expected to be paid within twelve months			2,108
Cycleo
Loss Contingencies [Line Items]
Earn-out liability			2,108	4,514
Earn-out liability expected to be paid within twelve months			2,108
Potential payments under earn-out arrangements, high estimate						$ 11,300
Payments for previous acquisition, to date			7,700
AptoVision
Loss Contingencies [Line Items]
Earn-out liability			0	2,161
Cash paid to acquire business		$ 17,600
Earn-out liability expected to be paid within twelve months			0
Payments for previous acquisition, to date			9,400
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date | AptoVision
Loss Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate		$ 47,000
Period over which contingent consideration will be paid		3 years
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
Loss Contingencies [Line Items]
Employer contribution to defined contribution plan			1,200	1,000	1,300
Foreign Plan | Pension Plan
Loss Contingencies [Line Items]
Unfunded net pension obligation			13,400
Pension plan assets			32,800
Projected benefit obligation of pension plan			46,200
Contributions made by the Company			1,600
Foreign Plan | Defined Contribution Plan
Loss Contingencies [Line Items]
Employer contribution to defined contribution plan			800	600	$ 800
Environmental Issue
Loss Contingencies [Line Items]
Payment towards remediation plan			4,400
Loss contingency accrual			1,500
Environmental Issue | Minimum
Loss Contingencies [Line Items]
Estimate of probable loss			5,900
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			24,300	20,400
Selling, general and administrative expenses
Loss Contingencies [Line Items]
Litigation settlement, amount awarded from other party			1,000	$ 8,000
French Plan
Loss Contingencies [Line Items]
Unfunded net pension obligation			400
Pension plan assets			0
Projected benefit obligation of pension plan			400
Net periodic pension expense			300
Contributions made by the Company			$ 0