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Income Taxes - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
National corporation tax | 24.00% | 24.00% | 24.00%
Inhabitant tax | 4.00% | 4.00% | 4.00%
Deductible enterprise tax | 4.00% | 4.00% | 4.00%
Statutory income tax rate | 31.50% | 31.50% | 31.50%
Net changes in total valuation allowance | ¥ (3,201) | ¥ 1,759 | ¥ 2,132
Net changes in total valuation allowance recognized in earnings due to the utilization of net operating loss carryforwards | (3,380) | (3,660) | (1,465)
Increase in valuation allowance | 1,143 | 4,125 | 2,120
Decrease in valuation allowance | 3,129 | 3,612 | 1,492
Net changes in valuation allowance | (1,986) | ¥ 513 | ¥ 628
Net operating loss carryforwards | ¥ 369,010 |  |
Statutory income tax rate before the revision | 31.00% |  |
Increase in provision of income taxes | ¥ 6,124 |  |
Statutory income tax rate after the revision | 31.90% |  |

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