v3.26.1
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, 2026
Mar. 31, 2025
Mar. 31, 2024
Japanese plans      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial gain (loss) ¥ 20,329 ¥ 5,125 ¥ 12,990
Amortization of net actuarial loss (139) (93) 59
Prior service credit due to amendments 0 (278) 0
Amortization of prior service credit (65) (72) (84)
Settlements 0 (148) 0
Total recognized in other comprehensive income (loss), pre-tax 20,125 4,534 12,965
Overseas plans      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial gain (loss) 3,141 3,226 5,728
Amortization of net actuarial loss 5 9 11
Prior service credit due to amendments (5) (179) (145)
Amortization of prior service credit (270) (322) (354)
Amortization of transition obligation 0 1 1
Foreign currency exchange rate change 1,882 (78) 641
Total recognized in other comprehensive income (loss), pre-tax ¥ 4,753 ¥ 2,657 ¥ 5,882