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Employee Benefits - Summary of Net Defined Benefit Liability (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Net Defined Benefit Liability Asset [Line Items]    
Present value of unfunded obligation $ 5,849 $ 4,834
Net defined benefit liability 5,849 4,834
Defined Benefit Obligation [Member]    
Disclosure Of Net Defined Benefit Liability Asset [Line Items]    
Present value of unfunded obligation 6,490 5,669
Fair Value of Plan Assets [Member]    
Disclosure Of Net Defined Benefit Liability Asset [Line Items]    
Less: fair value of plan assets $ (641) $ (835)