| Mar 31,
2018 | Mar 31,
2019 | Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Cash and deposits | - | 1,390 | 1,366 | 2,287 | 2,514 | 2,812 | 1,985 |
|---|
| Accounts receivable - trade | - | 313 | 443 | 315 | 283 | 193 | 207 |
|---|
| Contract assets | - | - | - | - | 383 | 412 | 428 |
|---|
| Real estate for sale in process | - | - | - | - | 88 | 561 | 874 |
|---|
| Prepaid expenses | - | - | - | - | - | 30 | 32 |
|---|
| Other | - | 51 | 55 | 51 | 50 | 87 | 124 |
|---|
| Accrued revenue | - | - | - | - | - | 3 | 6 |
|---|
| Allowance for doubtful accounts | - | - | - | - | - | -0 | -0 |
|---|
| Short-term loans receivable from subsidiaries and associates | - | - | - | - | - | 28 | - |
|---|
| Current assets | - | 2,420 | 2,419 | 3,304 | 3,578 | 4,065 | 3,619 |
|---|
| Current portion of long-term loans receivable from subsidiaries and associates | - | - | - | - | - | 471 | 839 |
|---|
| Other | - | 51 | 55 | 51 | 50 | 87 | 124 |
|---|
| Current assets | - | 2,420 | 2,419 | 3,304 | 3,578 | 4,065 | 3,619 |
|---|
| Buildings | - | 54 | 92 | 94 | 98 | 107 | 194 |
|---|
| Tools, furniture and fixtures | - | - | 48 | 48 | 52 | 57 | 56 |
|---|
| Accumulated depreciation | - | -63 | -66 | -76 | -88 | -97 | -99 |
|---|
| Property, plant and equipment | - | 37 | 75 | 66 | 62 | 67 | 150 |
|---|
| Goodwill | - | 17 | - | - | - | 13 | 467 |
|---|
| Software | - | - | - | - | - | 18 | 57 |
|---|
| Trademark right | - | - | - | - | - | 12 | 11 |
|---|
| Other | - | 2 | 21 | 21 | 31 | 50 | 11 |
|---|
| Software | - | - | - | - | - | 18 | 57 |
|---|
| Intangible assets | - | 19 | 21 | 21 | 31 | 63 | 534 |
|---|
| Other | - | 2 | 21 | 21 | 31 | 50 | 11 |
|---|
| Intangible assets | - | 19 | 21 | 21 | 31 | 63 | 534 |
|---|
| Investment securities | - | 48 | 65 | 53 | 143 | 143 | 58 |
|---|
| Shares of subsidiaries and associates | - | - | - | - | - | 68 | 95 |
|---|
| Investments in capital | - | - | - | - | - | 0 | 0 |
|---|
| Deferred tax assets | - | 93 | 87 | 84 | 105 | 131 | 136 |
|---|
| Long-term loans receivable from subsidiaries and associates | - | - | - | - | - | 96 | 131 |
|---|
| Guarantee deposits | - | - | - | - | - | 132 | 421 |
|---|
| Long-term prepaid expenses | - | - | - | - | - | 6 | 4 |
|---|
| Other | - | 186 | 202 | 152 | 145 | 158 | 12 |
|---|
| Deferred tax assets | - | 93 | 87 | 84 | 105 | 131 | 136 |
|---|
| Investments and other assets | - | 327 | 467 | 289 | 394 | 432 | 723 |
|---|
| Guarantee deposits | - | - | - | - | - | 132 | 421 |
|---|
| Other | - | 186 | 202 | 152 | 145 | 158 | 12 |
|---|
| Investments and other assets | - | 327 | 467 | 289 | 394 | 432 | 723 |
|---|
| Non-current assets | - | 383 | 562 | 376 | 487 | 562 | 1,407 |
|---|
| Assets | - | 2,803 | 2,981 | 3,680 | 4,064 | 4,627 | 5,026 |
|---|
| Current portion of long-term borrowings | - | 25 | 19 | 4 | - | - | 2 |
|---|
| Accounts payable - other | - | 171 | 155 | 167 | 148 | 224 | 197 |
|---|
| Income taxes payable | - | 116 | 20 | 109 | 138 | 172 | 127 |
|---|
| Contract liabilities | - | - | - | - | 205 | 195 | 203 |
|---|
| Provision for bonuses | - | 198 | 194 | 179 | 209 | 176 | 184 |
|---|
| Deposits received | - | - | - | - | - | 28 | 72 |
|---|
| Refund liabilities | - | - | - | 64 | 99 | 155 | 205 |
|---|
| Deposit for insurance company (credit) | - | - | - | - | - | 30 | 33 |
|---|
| Accounts payable - other | - | 171 | 155 | 167 | 148 | 224 | 197 |
|---|
| Provision for bonuses | - | 198 | 194 | 179 | 209 | 176 | 184 |
|---|
| Other | - | 119 | 89 | 149 | 99 | 142 | 142 |
|---|
| Refund liabilities | - | - | - | 64 | 99 | 155 | 205 |
|---|
| Current liabilities | - | 920 | 979 | 975 | 948 | 1,063 | 1,060 |
|---|
| Other | - | 119 | 89 | 149 | 99 | 142 | 142 |
|---|
| Current liabilities | - | 920 | 979 | 975 | 948 | 1,063 | 1,060 |
|---|
| Asset retirement obligations | - | - | 1 | 1 | 3 | 7 | 52 |
|---|
| Long-term borrowings | - | 22 | 4 | - | - | 5 | 2 |
|---|
| Non-current liabilities | - | 40 | 10 | 1 | 3 | 12 | 54 |
|---|
| Asset retirement obligations | - | - | 1 | 1 | 3 | 7 | 52 |
|---|
| Non-current liabilities | - | 40 | 10 | 1 | 3 | 12 | 54 |
|---|
| Liabilities | - | 961 | 989 | 976 | 951 | 1,075 | 1,113 |
|---|
| Share capital | - | 284 | 284 | 507 | 571 | 585 | 627 |
|---|
| Legal capital surplus | - | - | - | - | - | 485 | 527 |
|---|
| Capital surplus | - | 184 | 184 | 407 | 471 | 485 | 527 |
|---|
| Capital surplus | - | 184 | 184 | 407 | 471 | 485 | 527 |
|---|
| Retained earnings brought forward | - | - | - | - | - | 2,441 | 2,617 |
|---|
| Retained earnings | - | 1,363 | 1,518 | 1,778 | 2,112 | 2,563 | 2,881 |
|---|
| Retained earnings | - | 1,363 | 1,518 | 1,778 | 2,112 | 2,563 | 2,881 |
|---|
| Treasury shares | - | - | - | - | -88 | -88 | -132 |
|---|
| Shareholders' equity | - | 1,831 | 1,986 | 2,693 | 3,067 | 3,545 | 3,902 |
|---|
| Share acquisition rights | - | 0 | 0 | 0 | 0 | 0 | 0 |
|---|
| Valuation difference on available-for-sale securities | - | - | - | - | - | - | 0 |
|---|
| Valuation and translation adjustments | - | 11 | 5 | 11 | 46 | - | 0 |
|---|
| Net assets | 1,452 | 1,842 | 1,992 | 2,704 | 3,113 | 3,552 | 3,912 |
|---|
| Share acquisition rights | - | 0 | 0 | 0 | 0 | 0 | 0 |
|---|
| Non-controlling interests | - | - | - | - | - | 7 | 10 |
|---|
| Net assets | 1,452 | 1,842 | 1,992 | 2,704 | 3,113 | 3,552 | 3,912 |
|---|
| Liabilities and net assets | - | 2,803 | 2,981 | 3,680 | 4,064 | 4,627 | 5,026 |
|---|