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Acquisitions Of Businesses (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Feb. 01, 2021 Company | Jan. 11, 2021 Company | Nov. 06, 2020 Company | Aug. 03, 2020 Company | Jan. 02, 2020 Company | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 862,323 | $ 851,783
Number of businesses acquired | Company | 1 | 1 | 1 | 1 | 1 |  |
2020 Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 50,300
Working capital acquired |  |  |  |  |  |  | 3,000
Other net liabilities |  |  |  |  |  |  | 3,900
Goodwill |  |  |  |  |  |  | 13,100
Identifiable intangible assets |  |  |  |  |  |  | $ 38,100
2021Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 24,000 |
Working capital acquired |  |  |  |  |  | 4,400 |
Other net liabilities |  |  |  |  |  | 3,500 |
Goodwill |  |  |  |  |  | 10,400 |
Identifiable intangible assets |  |  |  |  |  | $ 12,700 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at 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=121647850&loc=d3e4845-128472 + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=120320667&loc=SL49117168-202975 Reference 3: 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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