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Income Taxes - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
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 | ¥ 2,132 | ¥ 13,595 | ¥ 6,191
Decrease in total valuation allowance recognized in earnings due to the utilization of net operating loss carryforwards | 1,465 | 1,742 | 553
Increase in valuation allowance | 2,120 | 1,947 | 1,032
Decrease in valuation allowance | 1,492 | 1,511 | 1,775
Net changes in valuation allowance | 628 | ¥ 436 | ¥ 743
Net operating loss carryforwards | ¥ 456,985 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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