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Retirement Plans - Summary Changes in Plan Assets and Benefit Obligations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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