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Income Taxes - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
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 | ¥ 1,759 | ¥ 2,132 | ¥ 13,595
Decrease in total valuation allowance recognized in earnings due to the utilization of net operating loss carryforwards | 3,660 | 1,465 | 1,742
Increase in valuation allowance | 4,125 | 2,120 | 1,947
Decrease in valuation allowance | 3,612 | 1,492 | 1,511
Net changes in valuation allowance | 513 | ¥ 628 | ¥ 436
Net operating loss carryforwards | ¥ 440,411 |  |

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