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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Dec. 31, 2007
Subsidiary, Sale of Stock [Line Items]            
Amounts outstanding under guarantee $ 89,822,000 $ 133,897,000 $ 89,822,000 $ 133,897,000 $ 107,615,000  
Value added tax expense $ 6,406,000 $ 2,847,000 $ 12,591,000 $ 8,611,000    
MTC            
Subsidiary, Sale of Stock [Line Items]            
Investment, cost method           $ 0