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Employee Benefit Plans (Defined Contribution Plans Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expense for defined contribution plans $ 8.7 $ 7.6 $ 5.8