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Schedule of Expected Amounts of Net Periodic Benefit Costs (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 USD ($)
Pension Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Unrecognized actuarial (loss) gain | $ (2,295)
Other Pension Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Unrecognized actuarial (loss) gain | 993
Unrecognized prior service credit | $ 2,780

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