Other Financial Assets - Schedule of Other Financial Assets (Details) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Other Financial Assets [Abstract] | ||
| Receivables from third party operators of deposit machines | ¥ 5,239 | ¥ 5,744 |
| Time deposits pledged as collateral | 5,128 | 3,677 |
| Accrued interest | 3,792 | 2,177 |
| Trade date accrual | 3,534 | 1,903 |
| Office security deposits | 2,946 | 3,725 |
| Receivables from customers and other parties in the securities intermediary business | 2,740 | 1,118 |
| Receivables from third parties for PayPay Gift Vouchers | 2,400 | 3 |
| Derivative assets | 2,310 | 2,234 |
| Accrued income | 1,949 | 1,741 |
| Other | 2,255 | 808 |
| Total | ¥ 32,293 | ¥ 23,130 |