Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)

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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at April 1 $ 838 $ 941 $ 783
Additions for tax position of prior years 0 59 158
Reductions for tax positions of prior years (50) (162) 0
Balance at March 31 $ 788 $ 838 $ 941