Revenue - Summary of Disaggregation of Revenue from Contracts with Customers by type of Service (Parenthetical) (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of disaggregation of revenue from contracts with customers [abstract] | |||
| Interchange fees | ¥ 11,023 | ¥ 10,819 | ¥ 12,427 |
| Consideration paid to customer | ¥ 4,554 | ¥ 3,408 | ¥ 1,870 |