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Retirement Plans - Summary Changes in Plan Assets and Benefit Obligations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Retirement Benefits [Abstract]      
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0 $ 0 $ 0
Changes in plan assets and benefit obligations:      
Net loss (gain) arising during the year (99) (1,953) 5,485
Effect of exchange rates on amounts included in AOCI (1,984) 3,019 (2,275)
Amounts recognized as a component of net periodic benefit costs:      
Amortization of prior service cost (45) (46) (42)
Amortization or settlement recognition of net loss (1,659) (1,725) (1,389)
Total recognized in other comprehensive income $ (3,787) $ (705) $ 1,779