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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 17, 2018 | May 02, 2018 | Jul. 01, 2017 | Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 351,141 | $ 341,897 |
Fair value of earn-out liability |  |  |  | 2,623 | 21,668 |
Borrowings under line of credit |  |  |  | 0 | 0 | $ 97,000
TrackNet |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 8,500 |  |  |  |  |
Goodwill | 4,300 |  |  | 4,316 |  |
Finite-lived intangible asset | 3,000 |  |  |  |  |
Tangible assets | $ 300 |  |  |  |  |
ICI |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 7,400 |  |  |  |
Goodwill |  | 4,900 |  |  |  |
Tangible assets |  | $ 2,500 |  |  |  |
AptoVision |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 12,200 | 12,194 |  |
Effective date of acquisition |  |  | Jul. 01, 2017 |  |  |
Name of acquired entity |  |  | AptoVision Technologies Inc. |  |  |
Cash paid to acquire business |  |  | $ 17,600 |  |  |
Fair value of earn-out liability |  |  |  | $ 2,161 | $ 21,000 |
Earn-out liability |  |  | 2,200 |  |  |
AptoVision | Accrued liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Earn-out liability |  |  | 1,300 |  |  |
AptoVision | Other long-term liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Earn-out liability |  |  | 900 |  |  |
AptoVision | Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate |  |  | $ 47,000 |  |  |
Period over which contingent consideration will be paid |  |  | 3 years |  |  |
AptoVision | Selling, general and administrative expenses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition related transaction costs |  |  | $ 1,600 |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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