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Income Taxes - Reconciliation of Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
United States statutory income tax expense |  | $ 35,729 | $ 30,857 | $ 38,264
Impact of Tax Act | $ 21,000 | 0 | 0 | (13,483)
State income taxes, net of federal effect |  | 4,000 | 2,764 | 3,285
Nondeductible expenses and other |  | 5,273 | 5,953 | 4,378
Legal proceedings charge - European Competition Investigations |  | 0 | 0 | 2,405
Net effect of GILTI, FDII, BEAT |  | 1,985 | 3,025 | 2,320
Goodwill impairment - See Note 7 |  | 0 | 10,714 | 0
Effect of foreign operations |  | (20,035) | (17,605) | (16,763)
Valuation allowance |  | 5,533 | 4,349 | 2,879
Switzerland Tax Reform |  | (1,883) | (26,846) | 0
Research and Development Credit |  | (3,841) | (3,390) | (1,701)
Total income tax expense |  | $ 26,761 | $ 9,821 | $ 21,584

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