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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 24,180 $ 15,607 $ 9,367
2020 27,500    
2021 23,200    
2022 20,000    
2023 15,900    
2024 13,000    
Thereafter $ 19,300