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Pension Plans (Net Pension Cost of Defined Benefit Plans) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Japan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost ¥ 5,078 ¥ 5,542 ¥ 5,704
Interest cost 1,421 1,216 731
Expected return on plan assets (2,766) (2,702) (2,739)
Amortization of prior service credit (72) (84) (47)
Amortization of net actuarial loss (93) 59 79
Plan amendments 0 0 (44)
Settlements (1,347) 0 0
Net periodic pension cost 2,221 4,031 3,684
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3,268 2,999 3,432
Interest cost 4,091 3,395 2,309
Expected return on plan assets (6,996) (6,362) (4,982)
Amortization of prior service credit (322) (354) (329)
Amortization of net actuarial loss 9 11 9
Amortization of transition obligation 1 1 1
Net periodic pension cost ¥ 51 ¥ (310) ¥ 440