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Related-Party Transactions (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Jul. 31, 2008
Related Party Transaction [Line Items]        
Management agreement, annual fee       $ 1,000,000.0
Management agreement, advisory fees $ 750,000 $ 1,000,000 $ 1,000,000  
Affiliated Entity [Member] | Pledge Obligation [Member]        
Related Party Transaction [Line Items]        
Amount of pledge $ 5,000,000