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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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- Definition

Corporate Inhabitant Tax Rate

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- Definition

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- Definition

Deferred Tax Assets Valuation Allowance, Increase

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- Definition

Deferred Tax Assets Valuation Allowance Increase (Decrease)

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- Definition

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

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- Definition

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
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-12

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4

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