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Acquisitions Of Businesses (Details) $ in Thousands									12 Months Ended
	Jan. 02, 2020 Company	Nov. 01, 2019 USD ($) Company	Oct. 31, 2019 Company	Sep. 16, 2019 Company	Aug. 01, 2019 Company	May 10, 2019 Company	Apr. 01, 2019 Company	Jan. 04, 2019 Company	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill									$ 1,063,911	$ 1,064,853
Number of businesses acquired | Company	1	1	1	1	1	1	1	1
BKI [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Purchase price		$ 220,000
Working capital acquired		29,800
Other net assets		4,900
Goodwill		43,600
Identifiable intangible assets		$ 141,700
Finite-Lived Intangible Asset, Useful Life									10 years 6 months
2019 Acquisitions
Business Acquisition [Line Items]
Purchase price									$ 85,300
Working capital acquired									25,300
Other net assets									1,300
Goodwill									29,100
Identifiable intangible assets									$ 29,600

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

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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