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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, 2024	Mar. 31, 2023
Japan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	¥ 17,886	¥ 17,335
Fair value of plan assets	2,854	2,563
Overseas plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	7,952	7,256
Fair value of plan assets	¥ 6,151	¥ 5,630

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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/exampleRef
-Topic 715
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-Name Accounting Standards Codification
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
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