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v3.23.3

Pension Plans (Net Pension Cost of Defined Benefit Plans) (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Japan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | ¥ 1,389 | ¥ 1,413 | ¥ 2,760 | ¥ 2,825
Interest cost | 301 | 174 | 601 | 347
Expected return on plan assets | (677) | (681) | (1,352) | (1,362)
Amortization of prior service credit | (21) | (7) | (42) | (13)
Amortization of net actuarial loss | 20 | 19 | 31 | 38
Net periodic pension cost | 1,012 | 918 | 1,998 | 1,835
Overseas plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 711 | 908 | 1,436 | 1,813
Interest cost | 582 | 508 | 1,470 | 1,010
Expected return on plan assets | (1,594) | (1,180) | (3,101) | (2,348)
Amortization of prior service credit | (90) | (79) | (183) | (157)
Amortization of net actuarial loss | 0 | 3 | 1 | 7
Amortization of transition obligation | 1 | 1 | 1 | 1
Net periodic pension cost | ¥ (390) | ¥ 161 | ¥ (376) | ¥ 326

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