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Income Taxes - Reconciliation of Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
United States statutory income tax expense | $ 85,381 | $ 61,358 | $ 44,233
State income taxes, net of federal effect | 7,361 | (995) | 1,714
Nondeductible expenses and other | 14,135 | 3,833 | 6,028
Net effect of GILTI, FDII, BEAT | 3,322 | 3,313 | 2,457
Effect of foreign operations | (14,074) | (17,475) | (12,978)
Valuation allowance | (4,270) | 6,849 | 2,068
Research and Development Credit | (5,652) | (5,158) | (5,063)
AMPC Impact | (38,764) | (28,636) | (3,630)
Tax Act | (4,597) | 0 | 0
Total income tax expense | $ 42,842 | $ 23,089 | $ 34,829

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