Investments in associates and joint ventures - Summary of Combined Information of Investments Accounted for Using the Equity Method (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Share of profit or loss | |||
| Total | ¥ (7,801) | ¥ 10,502 | ¥ 24,449 |
| Share of other comprehensive income | |||
| Total | (1,248) | 5,348 | 3,699 |
| Share of comprehensive income | |||
| Total | (9,049) | 15,850 | 28,148 |
| Aggregated Individually Immaterial Associates [member] | |||
| Share of profit or loss | |||
| Total | 19,746 | 19,727 | 22,637 |
| Share of other comprehensive income | |||
| Total | (1,268) | 5,311 | 3,659 |
| Share of comprehensive income | |||
| Total | 18,478 | 25,038 | 26,296 |
| Aggregated individually immaterial joint ventures [member] | |||
| Share of profit or loss | |||
| Total | (27,547) | (9,225) | 1,812 |
| Share of other comprehensive income | |||
| Total | 20 | 37 | 40 |
| Share of comprehensive income | |||
| Total | ¥ (27,527) | ¥ (9,188) | ¥ 1,852 |