Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes - Reconciliation of Unrecognized Tax Benefits and Interest and Penalties (Detail)

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Income Taxes - Reconciliation of Unrecognized Tax Benefits and Interest and Penalties (Detail) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions $ 100,000    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, Beginning balance 600,000 $ 700,000 $ 700,000
Unrecognized tax benefits, Additions for tax positions of the current year   100,000 0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   (200,000)  
Interest and penalties recognized income tax expense 0 100,000 0
Unrecognized tax benefits, Ending Balance 700,000 600,000 700,000
Interest and Penalties, Beginning balance 100,000 0 0
Interest and Penalties, Ending Balance $ 100,000 $ 100,000 $ 0