| Sep 30,
2019 | Sep 30,
2020 | Sep 30,
2021 | Sep 30,
2022 | Sep 30,
2023 |
|---|
| Cash and deposits | - | 1,210 | 1,719 | 1,388 | 2,247 |
|---|
| Accounts receivable - trade | - | 242 | 231 | 240 | 298 |
|---|
| Securities | - | 94 | 99 | 129 | 138 |
|---|
| Merchandise | - | 52 | 49 | 35 | 43 |
|---|
| Income taxes refund receivable | - | - | 75 | 13 | 2 |
|---|
| Other | - | 145 | 121 | 125 | 158 |
|---|
| Income taxes refund receivable | - | - | 75 | 13 | 2 |
|---|
| Allowance for doubtful accounts | - | -3 | -2 | -1 | -2 |
|---|
| Other | - | 145 | 121 | 125 | 158 |
|---|
| Current assets | - | 1,741 | 2,292 | 1,928 | 2,883 |
|---|
| Facilities attached to buildings | - | 159 | 163 | 152 | 169 |
|---|
| Accumulated depreciation | - | -71 | -80 | -81 | -89 |
|---|
| Facilities attached to buildings, net | - | 88 | 83 | 72 | 80 |
|---|
| Tools, furniture and fixtures | - | 61 | 67 | 48 | 40 |
|---|
| Accumulated depreciation | - | -51 | -52 | -42 | -32 |
|---|
| Tools, furniture and fixtures, net | - | 10 | 15 | 6 | 8 |
|---|
| Property, plant and equipment | - | 98 | 98 | 78 | 88 |
|---|
| Software | - | 16 | 23 | 34 | 34 |
|---|
| Other | - | 1 | 5 | 3 | 30 |
|---|
| Intangible assets | - | 17 | 28 | 37 | 64 |
|---|
| Investment securities | - | - | - | - | 21 |
|---|
| Guarantee deposits | - | 109 | 91 | 84 | 84 |
|---|
| Guarantee deposits | - | 109 | 91 | 84 | 84 |
|---|
| Long-term prepaid expenses | - | 40 | 13 | 21 | 12 |
|---|
| Deferred tax assets | - | 55 | 82 | 92 | 140 |
|---|
| Other | - | 11 | 11 | 11 | 18 |
|---|
| Investments and other assets | - | 218 | 186 | 196 | 263 |
|---|
| Allowance for doubtful accounts | - | -13 | -11 | -11 | -11 |
|---|
| Investments and other assets | - | 218 | 186 | 196 | 263 |
|---|
| Non-current assets | - | 332 | 312 | 311 | 416 |
|---|
| Assets | - | 2,073 | 2,604 | 2,239 | 3,298 |
|---|
| Accounts payable - trade | - | 117 | 149 | 150 | 190 |
|---|
| Current portion of long-term borrowings | - | 59 | 40 | 26 | 32 |
|---|
| Current portion of long-term borrowings | - | 59 | 40 | 26 | 32 |
|---|
| Accounts payable - other | - | 134 | 246 | 87 | 46 |
|---|
| Accounts payable - other | - | 134 | 246 | 87 | 46 |
|---|
| Accrued expenses | - | 54 | 54 | 71 | 140 |
|---|
| Accrued expenses | - | 54 | 54 | 71 | 140 |
|---|
| Income taxes payable | - | 28 | 99 | 111 | 155 |
|---|
| Contract liabilities | - | - | - | 355 | 378 |
|---|
| Accrued consumption taxes | - | 71 | 58 | 51 | 58 |
|---|
| Income taxes payable | - | 28 | 99 | 111 | 155 |
|---|
| Provision for bonuses | - | 78 | 153 | 179 | 206 |
|---|
| Provision for shareholder benefit program | - | - | - | - | 11 |
|---|
| Accrued consumption taxes | - | 71 | 58 | 51 | 58 |
|---|
| Other | - | 19 | 100 | 16 | 21 |
|---|
| Provision for bonuses | - | 78 | 153 | 179 | 206 |
|---|
| Current liabilities | - | 877 | 1,268 | 1,047 | 1,236 |
|---|
| Provision for shareholder benefit program | - | - | - | - | 11 |
|---|
| Other | - | 19 | 100 | 16 | 21 |
|---|
| Current liabilities | - | 877 | 1,268 | 1,047 | 1,236 |
|---|
| Liabilities | - | 1,344 | 1,689 | 1,436 | 1,594 |
|---|
| Long-term borrowings | - | 355 | 359 | 332 | 301 |
|---|
| Asset retirement obligations | - | 17 | 18 | 17 | 17 |
|---|
| Other | - | 49 | 44 | 40 | 39 |
|---|
| Non-current liabilities | - | 468 | 421 | 389 | 358 |
|---|
| Liabilities | - | 1,344 | 1,689 | 1,436 | 1,594 |
|---|
| Share capital | - | 127 | 127 | 127 | 181 |
|---|
| Capital surplus | - | 26 | 26 | 26 | 118 |
|---|
| Capital surplus | - | 26 | 26 | 26 | 118 |
|---|
| Retained earnings | - | 591 | 772 | 1,071 | 1,390 |
|---|
| Retained earnings | - | 591 | 772 | 1,071 | 1,390 |
|---|
| Treasury shares | - | - | - | -434 | - |
|---|
| Shareholders' equity | - | 744 | 925 | 790 | 1,689 |
|---|
| Share acquisition rights | - | 1 | 1 | 1 | 1 |
|---|
| Valuation difference on available-for-sale securities | - | -17 | -11 | 12 | 15 |
|---|
| Valuation and translation adjustments | - | -17 | -11 | 12 | 15 |
|---|
| Net assets | 610 | 728 | 915 | 803 | 1,705 |
|---|
| Share acquisition rights | - | 1 | 1 | 1 | 1 |
|---|
| Net assets | 610 | 728 | 915 | 803 | 1,705 |
|---|
| Liabilities and net assets | - | 2,073 | 2,604 | 2,239 | 3,298 |
|---|