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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Japan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial gain (loss) | ¥ 650 | ¥ 3,795 | ¥ 10,424
Amortization of net actuarial loss | 79 | 412 | 1,320
Prior service credit due to amendments | 881 | 367 | (402)
Amortization of prior service credit | (47) | (66) | (178)
Total recognized in other comprehensive income (loss), pre-tax | 1,563 | 4,508 | 11,164
Overseas plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial gain (loss) | 4,810 | 13,672 | (2,308)
Amortization of net actuarial loss | 9 | 500 | 313
Prior service credit due to amendments | (36) | (255) | (10)
Amortization of prior service credit | (329) | (320) | (269)
Amortization of transition obligation | 1 | 1 | 1
Foreign currency exchange rate change | 60 | (215) | (946)
Total recognized in other comprehensive income (loss), pre-tax | ¥ 4,515 | ¥ 13,383 | ¥ (3,219)

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