Commitments and Contingencies - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016	Jul. 01, 2017	Mar. 04, 2015	Mar. 07, 2012
Commitments And Contingencies [Line Items]
Rent expense	$ 5,900,000	$ 6,700,000	$ 7,700,000
Sublease income	141,000	$ 131,000	135,000
Net periodic pension expense	600,000
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	6,000,000	$ 4,300,000	(800,000)
Earn-out liability	26,520,000	6,068,000
Earn-out liability expected to be paid within twelve months	10,908,000
Other assets
Commitments And Contingencies [Line Items]
Cash surrender value of life insurance	22,300,000	18,900,000
Cycleo [Member]
Commitments And Contingencies [Line Items]
Earn-out liability	5,520,000	6,068,000
Earn-out liability expected to be paid within twelve months	2,008,000
Potential payments under earn-out arrangements, high estimate						$ 16,000,000
AptoVision
Commitments And Contingencies [Line Items]
Earn-out liability	21,000,000	0
Earn-out liability expected to be paid within twelve months	8,900,000
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] | Triune Systems
Commitments And Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate					$ 70,000,000
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] | AptoVision
Commitments And Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate				$ 47,000,000
Additional Earn-out Payable After Third Fiscal Year From Acquisition Date [Member] | Triune Systems
Commitments And Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate					$ 16,000,000
Minimum | Environmental Issue [Member]
Commitments And Contingencies [Line Items]
Estimate of probable loss	4,400,000
Maximum | Environmental Issue [Member]
Commitments And Contingencies [Line Items]
Estimate of probable loss	7,200,000
Net Income Correction
Commitments And Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		1,400,000
Pension Obligation Correction
Commitments And Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		5,800,000
Deferred Income Tax Assets Correction
Commitments And Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		1,300,000
Accumulated Other Comprehensive Income Correction
Commitments And Contingencies [Line Items]
Impact of immaterial prior year error corrected in fiscal year 2017		3,100,000
Domestic Plan [Member] | Defined Contribution Plan [Member]
Commitments And Contingencies [Line Items]
Employer contribution to defined contribution plan	1,300,000	1,200,000	1,300,000
Foreign Plan [Member] | Pension Plan [Member]
Commitments And Contingencies [Line Items]
Unfunded net pension obligation	4,300,000
Pension plan assets	25,500,000
Projected benefit obligation of pension plan	29,800,000
Contributions made by the Company	900,000
Foreign Plan [Member] | Defined Contribution Plan [Member]
Commitments And Contingencies [Line Items]
Employer contribution to defined contribution plan	$ 800,000	$ 1,000,000	$ 1,100,000