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Pension Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Japan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial gain (loss) | ¥ 12,990 | ¥ 650 | ¥ 3,795
Amortization of net actuarial loss | 59 | 79 | 412
Prior service credit due to amendments | 0 | 881 | 367
Amortization of prior service credit | (84) | (47) | (66)
Total recognized in other comprehensive income (loss), pre-tax | 12,965 | 1,563 | 4,508
Overseas plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial gain (loss) | 5,728 | 4,810 | 13,672
Amortization of net actuarial loss | 11 | 9 | 500
Prior service credit due to amendments | (145) | (36) | (255)
Amortization of prior service credit | (354) | (329) | (320)
Amortization of transition obligation | 1 | 1 | 1
Foreign currency exchange rate change | 641 | 60 | (215)
Total recognized in other comprehensive income (loss), pre-tax | ¥ 5,882 | ¥ 4,515 | ¥ 13,383

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