v3.25.2
Revenue - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Statements [Line Items]      
Revenue from contracts with customers ¥ 461,340 ¥ 444,964 ¥ 303,779
Amortisation, assets recognised from costs incurred to obtain or fulfil contracts with customers ¥ 2,380 ¥ 4,562 ¥ 4,686
Bottom of range [member]      
Statements [Line Items]      
Remaining performance obligation expected timing of satisfaction 1 year 1 year  
Top of range [member]      
Statements [Line Items]      
Remaining performance obligation expected timing of satisfaction 3 years 3 years