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Business Acquisitions (Narrative) (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
business
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]    
Goodwill $ 1,557,078,000 $ 1,531,455,000
Increase (decrease) in goodwill from adjustment under purchase accounting $ 4,173,000  
Series of Individually Immaterial Business Acquisitions    
Business Acquisition [Line Items]    
Number of businesses acquired | business 2  
Fiscal 2022 Acquisitions    
Business Acquisition [Line Items]    
Revenue of acquiree since acquisition date $ 2,100,000  
Total consideration of transactions 36,600,000  
Fair value of accounts receivable acquired 4,600,000  
Amount expected to be uncollectable 0  
Goodwill 24,156,000  
Expected income tax deductible amount 2,200,000  
Fiscal 2022 Acquisitions | Digital Media    
Business Acquisition [Line Items]    
Increase (decrease) in goodwill from adjustment under purchase accounting 2,100,000  
Fiscal 2022 Acquisitions | Cybersecurity and Martech    
Business Acquisition [Line Items]    
Increase (decrease) in goodwill from adjustment under purchase accounting $ 2,000,000