v3.25.2
Employee benefits - Summary of Defined Contribution Expenses (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Japanese Plans [Member]      
Disclosure of Detailed Information About Defined Contribution Plans Explanatory [Line Items]      
Total defined contribution expenses ¥ 11,849 ¥ 11,662 ¥ 11,461
Foreign Plans [Member]      
Disclosure of Detailed Information About Defined Contribution Plans Explanatory [Line Items]      
Total defined contribution expenses ¥ 17,209 ¥ 16,137 ¥ 17,271