Contingent Liabilities (Narrative) (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Commitments and Contingencies Disclosure [Abstract] | |||
| Allowance for repayment of excess interest | ¥ 5,439 | ¥ 7,073 | |
| Provision (reversal) for repayment of excess interest recognized on Equity in earnings of equity method investee | ¥ 15,852 | ¥ 0 | ¥ 0 |