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Acquisitions Of Businesses (Details) $ in Thousands								6 Months Ended	10 Months Ended
	May 10, 2019 Company	Apr. 01, 2019 Company	Jan. 04, 2019 Company	Nov. 01, 2018 Company	Oct. 02, 2018 Company	May 03, 2018 Company	Apr. 04, 2018 Company	Jun. 30, 2019 USD ($)	Nov. 01, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill								$ 1,013,822		$ 990,887
Number of businesses acquired | Company	1	1	1	1	1	1	1
2019 Acquisitions
Business Acquisition [Line Items]
Purchase price								64,400
Working capital acquired								18,500
Other net assets								200
Goodwill								22,800
Identifiable intangible assets								$ 22,900
2018 Acquisitions
Business Acquisition [Line Items]
Purchase price									$ 71,600
Working capital acquired										8,900
Goodwill										26,100
Identifiable intangible assets										$ 36,600

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The amount of acquisition cost of a business combination allocated to other net assets.

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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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