| Sep 30,
2018 | Sep 30,
2019 | Sep 30,
2020 | Sep 30,
2021 | Sep 30,
2022 | Sep 30,
2023 |
|---|
| Cash and deposits | - | 1,576 | 4,980 | 4,763 | 5,675 | 6,643 |
|---|
| Notes and accounts receivable - trade | - | 1,083 | 1,467 | 1,885 | 2,211 | 2,722 |
|---|
| Notes receivable - trade | - | - | - | - | 38 | - |
|---|
| Accounts receivable - trade | - | - | - | - | 2,173 | 2,722 |
|---|
| Accounts receivable - other | - | - | - | - | 118 | 530 |
|---|
| Accounts receivable - other | - | - | - | - | 118 | 530 |
|---|
| Other | - | 138 | 188 | 202 | 368 | 372 |
|---|
| Allowance for doubtful accounts | - | -33 | -44 | -64 | -102 | -610 |
|---|
| Other | - | 138 | 188 | 202 | 368 | 372 |
|---|
| Current assets | - | 2,764 | 6,590 | 6,786 | 8,152 | 9,658 |
|---|
| Allowance for doubtful accounts | - | -33 | -44 | -64 | -102 | -610 |
|---|
| Current assets | - | 2,764 | 6,590 | 6,786 | 8,152 | 9,658 |
|---|
| Facilities attached to buildings | - | 6 | 10 | 70 | 75 | 312 |
|---|
| Tools, furniture and fixtures, net | - | 36 | 27 | 62 | 48 | 114 |
|---|
| Property, plant and equipment | - | 42 | 37 | 133 | 123 | 426 |
|---|
| Software | - | 33 | 101 | 124 | 104 | 136 |
|---|
| Software in progress | - | 25 | 28 | 22 | 49 | - |
|---|
| Other | - | 2 | 2 | 2 | 1 | 1 |
|---|
| Intangible assets | - | 116 | 132 | 148 | 154 | 137 |
|---|
| Investment securities | - | 69 | 65 | 68 | 117 | 51 |
|---|
| Deferred tax assets | - | 104 | 179 | 131 | 145 | 339 |
|---|
| Leasehold deposits | - | - | - | - | 226 | 650 |
|---|
| Other | - | 191 | 378 | 339 | 233 | 35 |
|---|
| Deferred tax assets | - | 104 | 179 | 131 | 145 | 339 |
|---|
| Allowance for doubtful accounts | - | - | -45 | - | - | - |
|---|
| Leasehold deposits | - | - | - | - | 226 | 650 |
|---|
| Investments and other assets | - | 365 | 578 | 538 | 494 | 1,074 |
|---|
| Other | - | 191 | 378 | 339 | 233 | 35 |
|---|
| Allowance for doubtful accounts | - | - | -45 | - | - | - |
|---|
| Investments and other assets | - | 365 | 578 | 538 | 494 | 1,074 |
|---|
| Non-current assets | - | 523 | 746 | 818 | 771 | 1,638 |
|---|
| Assets | - | 3,287 | 7,336 | 7,604 | 8,923 | 11,296 |
|---|
| Accounts payable - trade | - | 321 | 453 | 506 | 424 | 391 |
|---|
| Current portion of long-term borrowings | - | 398 | 505 | 405 | 445 | 933 |
|---|
| Accounts payable - other | - | 217 | 339 | 443 | 566 | 2,024 |
|---|
| Accrued expenses | - | 135 | 157 | 220 | 220 | 305 |
|---|
| Income taxes payable | - | 206 | 247 | 182 | 408 | 26 |
|---|
| Provision for bonuses | - | 141 | 157 | 189 | 199 | 237 |
|---|
| Allowance for Losses related to trust-type stock options | - | - | - | - | - | 683 |
|---|
| Other | - | 98 | 267 | 263 | 282 | 321 |
|---|
| Current liabilities | - | 1,516 | 2,445 | 2,208 | 2,544 | 4,920 |
|---|
| Long-term borrowings | - | 814 | 864 | 460 | 378 | 878 |
|---|
| Asset retirement obligations | - | 37 | 29 | 89 | 60 | 166 |
|---|
| Long-term deposits received | - | - | - | - | - | 116 |
|---|
| Long-term accrued expenses | - | - | - | - | - | 162 |
|---|
| Provision for bonuses | - | - | - | - | - | 9 |
|---|
| Non-current liabilities | - | 851 | 894 | 548 | 438 | 1,332 |
|---|
| Liabilities | - | 2,368 | 3,339 | 2,756 | 2,983 | 6,251 |
|---|
| Share capital | - | 31 | 1,364 | 1,372 | 1,377 | 1,424 |
|---|
| Capital surplus | - | 21 | 1,354 | 1,362 | 1,367 | 1,464 |
|---|
| Capital surplus | - | 21 | 1,354 | 1,362 | 1,367 | 1,464 |
|---|
| Retained earnings | - | 865 | 1,272 | 2,114 | 3,196 | 2,154 |
|---|
| Retained earnings | - | 865 | 1,272 | 2,114 | 3,196 | 2,154 |
|---|
| Treasury shares | - | - | - | -0 | -0 | -1 |
|---|
| Shareholders' equity | - | 917 | 3,990 | 4,847 | 5,940 | 5,042 |
|---|
| Valuation difference on available-for-sale securities | - | 0 | -0 | - | 0 | - |
|---|
| Valuation and translation adjustments | - | 1 | 6 | - | 0 | - |
|---|
| Share acquisition rights | - | 1 | 1 | 1 | 1 | 3 |
|---|
| Net assets | 885 | 919 | 3,997 | 4,848 | 5,940 | 5,044 |
|---|
| Liabilities and net assets | - | 3,287 | 7,336 | 7,604 | 8,923 | 11,296 |
|---|