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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, 2016 USD ($)
Pension Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Unrecognized actuarial (loss) gain | $ (1,821)
Other Pension Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Unrecognized actuarial (loss) gain | 1,072
Unrecognized prior service credit (cost) | $ 4,346

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