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Schedule of Fair Values of Defined Benefit Plans (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | $ 39,009 | $ 36,541 | $ 33,412
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 3,470 | 4,525 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 34,579 | 31,516 |
Real Estate Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 107 | 144 |
Commodity Linked Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans |  | 212 |
Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | $ 853 | $ 144 |

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