v3.26.1
Inventories - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Classes of current inventories [abstract]      
Write-down of inventories recognized as an expense ¥ 49,804 ¥ 120,919 ¥ 12,220