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Pension Plans (Net Pension Cost of Defined Benefit Plans) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Japan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost ¥ 5,542 ¥ 5,704 ¥ 6,058
Interest cost 1,216 731 791
Expected return on plan assets (2,702) (2,739) (2,663)
Amortization of prior service credit (84) (47) (66)
Amortization of net actuarial loss 59 79 412
Plan amendments 0 (44) 0
Net periodic pension cost 4,031 3,684 4,532
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2,999 3,432 3,947
Interest cost 3,395 2,309 1,329
Expected return on plan assets (6,362) (4,982) (4,192)
Amortization of prior service credit (354) (329) (320)
Amortization of net actuarial loss 11 9 500
Amortization of transition obligation 1 1 1
Net periodic pension cost ¥ (310) ¥ 440 ¥ 1,265