Other Operating Income and Expenses - Narrative (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Disclosure of other provisions [line items] | |||
| Other expenses, write-off of option fees paid | ¥ 16,470 | ||
| Other | ¥ 69,650 | ¥ 84,666 | 60,178 |
| Post trial access cost | ¥ 27,004 | ||
| Legal proceedings provision | |||
| Disclosure of other provisions [line items] | |||
| Other | 45,212 | ¥ 16,455 | |
| Legal proceedings provision | AbbVie Supply Agreement Litigation | |||
| Disclosure of other provisions [line items] | |||
| Other | ¥ 26,405 | ||