Financial Risk Management - Summary of Lease liabilities by maturity (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure Of Lease Liabilities By Maturity [Line Items] | ||
| Lease liabilities | ¥ 326,944 | ¥ 322,923 |
| Total contractual cash flows | 373,875 | 363,353 |
| Within 1 year [member] | ||
| Disclosure Of Lease Liabilities By Maturity [Line Items] | ||
| Total contractual cash flows | 78,181 | 72,062 |
| Between 1 and 5 years [member] | ||
| Disclosure Of Lease Liabilities By Maturity [Line Items] | ||
| Total contractual cash flows | 117,186 | 103,245 |
| Later than 5 years [member] | ||
| Disclosure Of Lease Liabilities By Maturity [Line Items] | ||
| Total contractual cash flows | ¥ 178,508 | ¥ 188,046 |