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Business Segments (Goodwill and Intangible Assets by Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 3,054,570 $ 3,085,793
United States    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) 2,951,864 2,971,753
Rest of world    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 102,706 $ 114,040