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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]            
Market capitalization       $ 3,405,372,286 $ 4,000,000,000 $ 2,500,000,000
Amortization of intangible assets $ 9,367,000 $ 1,885,000 $ 8,361,000      
2018 10,400,000          
2019 10,400,000          
2020 10,400,000          
2021 6,000,000          
2022 5,100,000          
Thereafter 5,300,000          
Continuing Operations            
Finite-Lived Intangible Assets [Line Items]            
Amortization of intangible assets $ 9,400,000 $ 400,000 $ 800,000