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Income Taxes - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	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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Corporate Inhabitant Tax Rate

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Deferred Tax Assets Valuation Allowance, Increase

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Deferred tax assets valuation allowance increase (decrease) recognized in earnings.

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EnterpriseTaxRate

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- Definition

National Corporate Tax Rate

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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
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-Name Accounting Standards Codification
-Topic 235
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-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 12
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) in valuation and qualifying accounts and reserves.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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