v3.26.1
Selling, general and administrative expenses - Narrative (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Analysis of income and expense [abstract]      
Computer software expense ¥ 327 ¥ 291 ¥ 261