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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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