Revenue - Additional Information (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Statements [Line Items] | |||
| Revenue from contracts with customers | ¥ 561,184 | ¥ 461,340 | ¥ 444,964 |
| Amortisation, assets recognised from costs incurred to obtain or fulfil contracts with customers | ¥ 3,919 | ¥ 2,380 | ¥ 4,562 |
| 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 | |