Financial risk management - Summary of Price Sensitivity Analysis (Detail) - Trading equity securities [member] - Equity price risk [member] - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items] | ||
| Income before income taxes | ¥ (44,693) | ¥ (47,269) |
| Other comprehensive income (before considering the tax effects) | ¥ (14,854) | ¥ (8,114) |
| Decreased market prices of marketable equity instruments | 10.00% | 10.00% |