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Retirement Plans - Summary of Pension Plan Investments Measured at Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | ---
United States Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | $ 13,763 | $ 13,928 | $ 12,731
United States Plans | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 13,763 | 13,928 |
United States Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 1,080 | 891 |
United States Plans | Cash and Cash Equivalents | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 1,080 | 891 |
United States Plans | US Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 8,275 | 9,864 |
United States Plans | US Equity Securities | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 8,275 | 9,864 |
United States Plans | International Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 0 | 0 |
United States Plans | International Equity Securities | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 0 | 0 |
United States Plans | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 4,408 | 3,173 |
United States Plans | Fixed Income Funds | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 4,408 | 3,173 |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 36,791 | 38,757 | $ 34,323
International Plans | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 83 | 49 |
International Plans | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 36,708 | 38,708 |
International Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 83 | 49 |
International Plans | Cash and Cash Equivalents | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 83 | 49 |
International Plans | International Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 23,875 | 25,768 |
International Plans | International Equity Securities | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 0 |  |
International Plans | International Equity Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 23,875 | 25,768 |
International Plans | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 12,833 | 12,940 |
International Plans | Fixed Income Funds | Quoted Price In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | 0 |  |
International Plans | Fixed Income Funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurement | $ 12,833 | $ 12,940 |

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