Commitments and contingencies - Narrative (Details) newEconomyMovementToken in Millions |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2025
lawsuit
|
Jan. 31, 2018
JPY (¥)
newEconomyMovementToken
|
Mar. 31, 2025
JPY (¥)
lawsuit
|
Mar. 31, 2024
JPY (¥)
|
|
| Disclosure of non-adjusting events after reporting period [line items] | ||||
| Contractual commitment amount related to lease contract | ¥ | ¥ 65,000,000 | ¥ 0 | ||
| Loss from cybersecurity incident, number of NEM | newEconomyMovementToken | 526.3 | |||
| Loss from cybersecurity incident, value of NEM | ¥ | ¥ 46,600,000,000 | |||
| Number of lawsuits, unresolved | lawsuit | 1 | |||
| Entering into significant commitments or contingent liabilities | ||||
| Disclosure of non-adjusting events after reporting period [line items] | ||||
| Number of lawsuits | lawsuit | 1 | |||