| Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 |
|---|
| Cash and deposits | - | 6,943 | 12,042 | 9,352 |
|---|
| Segregated deposits | - | 31,678 | 40,206 | 32,750 |
|---|
| Segregated deposits for customers | - | 8,950 | 17,550 | 9,400 |
|---|
| Cash division as deposits for customers | - | 22,432 | 22,592 | 23,257 |
|---|
| Other segregated deposits | - | 295 | 63 | 92 |
|---|
| Short-term guarantee deposits | - | 52,955 | 49,554 | 53,110 |
|---|
| Foreign exchange deposit dealings receivable | - | 17,608 | 19,411 | 24,663 |
|---|
| Other | - | 354 | 353 | 538 |
|---|
| Short-term loans receivable | - | 1,119 | 1,798 | - |
|---|
| Allowance for doubtful accounts | - | -3 | -5 | - |
|---|
| Other | - | 354 | 353 | 538 |
|---|
| Current assets | - | 110,656 | 123,361 | 120,415 |
|---|
| Allowance for doubtful accounts | - | -3 | -5 | - |
|---|
| Current assets | - | 110,656 | 123,361 | 120,415 |
|---|
| Property, plant and equipment | - | 137 | 279 | 207 |
|---|
| Buildings, net | - | 85 | 224 | 161 |
|---|
| Other, net | - | - | 55 | 45 |
|---|
| Intangible assets | - | 448 | 529 | 539 |
|---|
| Software | - | 251 | 518 | 463 |
|---|
| Other | - | 196 | 10 | 76 |
|---|
| Investments and other assets | - | 890 | 1,238 | 1,116 |
|---|
| Investment securities | - | 119 | 107 | 98 |
|---|
| Investments in capital | - | 514 | 834 | 845 |
|---|
| Deferred tax assets | - | 38 | 61 | 65 |
|---|
| Other | - | 218 | 235 | 107 |
|---|
| Allowance for doubtful accounts | - | - | - | - |
|---|
| Allowance for doubtful accounts | - | - | - | - |
|---|
| Non-current assets | - | 1,476 | 2,047 | 1,863 |
|---|
| Assets | - | 112,132 | 125,409 | 122,278 |
|---|
| Guarantee deposits received | - | 83,496 | 96,094 | 94,751 |
|---|
| Short-term borrowings | - | 1,800 | 5,889 | 3,500 |
|---|
| Foreign exchange deposit dealings payable-CL | - | 15,210 | 10,588 | 11,264 |
|---|
| Income taxes payable | - | 54 | 267 | 164 |
|---|
| Income taxes payable | - | 54 | 267 | 164 |
|---|
| Provision for bonuses for directors (and other officers) | - | 19 | 47 | 24 |
|---|
| Provision for bonuses | - | 37 | 37 | 36 |
|---|
| Provision for bonuses for directors (and other officers) | - | 19 | 47 | 24 |
|---|
| Other | - | 420 | 527 | 546 |
|---|
| Other | - | 420 | 527 | 546 |
|---|
| Current liabilities | - | 101,297 | 113,451 | 110,287 |
|---|
| Current liabilities | - | 101,297 | 113,451 | 110,287 |
|---|
| Deferred tax liabilities | - | 86 | 211 | 222 |
|---|
| Other | - | 13 | 71 | 23 |
|---|
| Non-current liabilities | - | 100 | 283 | 246 |
|---|
| Liabilities | - | 101,406 | 113,742 | 110,543 |
|---|
| Reserve for financial instruments transaction liabilities | - | 7 | 7 | 10 |
|---|
| Reserves under special laws | - | 7 | 7 | 10 |
|---|
| Liabilities | - | 101,406 | 113,742 | 110,543 |
|---|
| Share capital | - | 500 | 500 | 500 |
|---|
| Capital surplus | - | 7,646 | 7,646 | 7,646 |
|---|
| Capital surplus | - | 7,646 | 7,646 | 7,646 |
|---|
| Retained earnings | - | 2,422 | 3,013 | 2,959 |
|---|
| Retained earnings | - | 2,422 | 3,013 | 2,959 |
|---|
| Treasury shares | - | - | - | - |
|---|
| Shareholders' equity | - | 10,569 | 11,159 | 11,106 |
|---|
| Valuation difference on available-for-sale securities | - | 235 | 528 | 568 |
|---|
| Foreign currency translation adjustment | - | -83 | -30 | 50 |
|---|
| Valuation and translation adjustments | - | 152 | 498 | 619 |
|---|
| Share acquisition rights | - | 4 | 8 | 8 |
|---|
| Share acquisition rights | - | 4 | 8 | 8 |
|---|
| Net assets | 10,849 | 10,726 | 11,666 | 11,734 |
|---|
| Net assets | 10,849 | 10,726 | 11,666 | 11,734 |
|---|
| Liabilities and net assets | - | 112,132 | 125,409 | 122,278 |
|---|