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Pension Plans (Summary of Accumulated Benefit Obligations and Fair Value of Plan Assets for Pension Plans) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2023	Mar. 31, 2022
Japan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	¥ 17,335	¥ 13,386
Fair value of plan assets	2,563	0
Overseas plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	7,256	7,407
Fair value of plan assets	¥ 5,630	¥ 5,842

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- Definition

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- Definition

Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920

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-Publisher FASB
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
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