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Business and Basis of Presentation (Intangible Assets) (Details)
12 Months Ended
Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]  
Intangible assets, useful lives 15 years
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Intangible assets, useful lives 10 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Intangible assets, useful lives 30 years