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Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected cash contributions to pension plans in 2014 | $ 1,640 |  |
Defined Contribution Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer expenses | 12,078 | $ 8,931 | $ 7,447
United States Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer expenses | 138 | 503 |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer expenses | $ 1,670 | $ 1,865 |
International Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage | 65.00% |  |
Minimum | United States Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity investments target range, minimum | 40.00% |  |
Maximum | United States Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity investments target range, minimum | 75.00% |  |

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