Employee Benefit Plans - Summary of Increase (Decrease) in Accumulated Other Comprehensive Loss, Net of Income Tax (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
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Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | $ (1,774) | $ 525 | $ 348 |
| Pension Plans, Defined Benefit [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Net actuarial (gain) loss arising during the year | (1,488) | 1,298 | |
| Amortization of actuarial loss | (807) | (750) | |
| Total | (2,295) | 548 | |
| Other Postretirement Benefit Plans [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Net actuarial (gain) loss arising during the year | (2) | (2) | |
| Amortization of actuarial loss | (21) | (21) | |
| Total | $ (23) | $ (23) | |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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