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Business Segments (Goodwill and Intangible Assets by Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 3,401,014 $ 3,518,865
United States    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) 3,278,021 3,396,285
Rest of world    
Schedule of Goodwill and Intangible Assets by Geographic Areas [Line Items]    
Intangible assets, net (including goodwill) $ 122,993 $ 122,580