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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 17, 2018 | May 02, 2018 | Jul. 01, 2017 | Jan. 26, 2020 | Jan. 27, 2019 | Jan. 28, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 351,141 | $ 351,141 |
Fair value of earn-out liability |  |  |  | 2,108 | 6,675 |
Borrowings under line of credit |  |  |  | 201,000 | 0 | $ 0
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 |  |  |
Payments for previous acquisition, to date |  |  |  | 9,400 |  |
Fair value of earn-out liability |  |  |  | $ 0 | 2,161 |
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 |  |  |  |  |  |
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 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=116869197&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=116868840&loc=d3e2207-128464 + Details
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