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Acquisitions Of Businesses (Details) $ in Thousands						3 Months Ended	12 Months Ended
	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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The amount of acquisition cost of a business combination allocated to other net liabilities.

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The amount of acquisition cost of a business combination allocated to working capital.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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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.

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