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Related-Party Transactions (Details) - Affiliated Entity
$ in Millions
12 Months Ended
Mar. 31, 2020
USD ($)
director
Mar. 31, 2019
USD ($)
Mar. 31, 2017
USD ($)
Related Party Transaction [Line Items]      
Number of directors 2    
Number of directors appointable 5    
Pledge Obligation      
Related Party Transaction [Line Items]      
Amount of pledge | $     $ 5.0
Services Performed Under Subcontractor      
Related Party Transaction [Line Items]      
Number of directors 2    
Amount of related party transaction | $ $ 79.7 $ 55.3