Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
6 Months Ended
Sep. 30, 2017
Mar. 31, 2017
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 2014  
Earliest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2012  
Earliest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2014  
Latest Tax Year [Member] | Federal Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Latest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Latest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016