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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