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Income Taxes - Additional Information (Detail) - USD ($)
6 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Income Taxes [Line Items]    
Liability unrecognized tax benefits $ 0 $ 0
Earliest Tax Year [Member] | Federal Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2015  
Earliest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2014  
Earliest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Latest Tax Year [Member] | Federal Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2018  
Latest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2018  
Latest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2018