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Business Segments (Goodwill and Intangible Assets by Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 3,053,808 $ 3,054,570
United States    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) 2,932,722 2,951,864
Rest of world    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 121,086 $ 102,706