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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 |  |  |

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