| Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Cash and deposits | - | 676 | 803 | 1,197 |
|---|
| Accounts receivable-trade and contract assets | - | 349 | 404 | 509 |
|---|
| Supplies | - | 0 | 0 | 0 |
|---|
| Advance payments to suppliers | - | 2 | 3 | 1 |
|---|
| Prepaid expenses | - | 40 | 46 | 59 |
|---|
| Other | - | 16 | 2 | 4 |
|---|
| Allowance for doubtful accounts | - | -0 | -0 | -0 |
|---|
| Current assets | - | 1,083 | 1,258 | 1,770 |
|---|
| Buildings, net | - | 180 | 302 | 335 |
|---|
| Structures, net | - | 45 | 42 | 38 |
|---|
| Tools, furniture and fixtures, net | - | 85 | 115 | 124 |
|---|
| Land | - | 17 | 17 | 17 |
|---|
| Leased assets, net | - | 22 | 65 | 74 |
|---|
| Property, plant and equipment | - | 350 | 541 | 587 |
|---|
| Goodwill | - | 5 | 2 | - |
|---|
| Trademark right | - | 1 | 0 | 0 |
|---|
| Software | - | 8 | 5 | 3 |
|---|
| Intangible assets | - | 14 | 7 | 3 |
|---|
| Investment securities | - | 2 | 2 | 2 |
|---|
| Investments in capital | - | 0 | 0 | 0 |
|---|
| Long-term prepaid expenses | - | 4 | 2 | 3 |
|---|
| Deferred tax assets | - | - | 41 | 38 |
|---|
| Guarantee deposits | - | 114 | 138 | 132 |
|---|
| Long-term loans receivable | - | 3 | 3 | 3 |
|---|
| Long-term loans receivable from employees | - | 0 | 0 | - |
|---|
| Other | - | 0 | 0 | 2 |
|---|
| Investments and other assets | - | 124 | 186 | 180 |
|---|
| Non-current assets | - | 488 | 735 | 770 |
|---|
| Assets | - | 1,571 | 1,993 | 2,540 |
|---|
| Accounts payable - trade | - | 3 | 4 | 3 |
|---|
| Current portion of long-term borrowings | - | 42 | 45 | 13 |
|---|
| Lease liabilities | - | 7 | 18 | 23 |
|---|
| Accounts payable - other | - | 72 | 91 | 140 |
|---|
| Accrued expenses | - | 97 | 118 | 149 |
|---|
| Income taxes payable | - | 27 | 34 | 61 |
|---|
| Contract liabilities | - | 17 | 0 | 0 |
|---|
| Advances received | - | 0 | 0 | 0 |
|---|
| Deposits received | - | 29 | 33 | 55 |
|---|
| Provision for bonuses | - | 19 | 25 | 31 |
|---|
| Other | - | 38 | 36 | 53 |
|---|
| Current liabilities | - | 672 | 405 | 529 |
|---|
| Long-term borrowings | - | 190 | 145 | 64 |
|---|
| Lease liabilities | - | 17 | 54 | 60 |
|---|
| Long-term accounts payable - other | - | 19 | 26 | 17 |
|---|
| Provision for retirement benefits | - | 2 | 7 | 11 |
|---|
| Asset retirement obligations | - | 5 | 24 | 24 |
|---|
| Other | - | 0 | 0 | 0 |
|---|
| Non-current liabilities | - | 235 | 256 | 176 |
|---|
| Liabilities | - | 907 | 661 | 705 |
|---|
| Share capital | - | 744 | 985 | 1,163 |
|---|
| Legal capital surplus | - | 684 | 925 | 1,103 |
|---|
| Capital surplus | - | 684 | 925 | 1,103 |
|---|
| Retained earnings brought forward | - | -765 | -578 | -432 |
|---|
| Retained earnings | - | -765 | -578 | -432 |
|---|
| Shareholders' equity | - | 663 | 1,333 | 1,835 |
|---|
| Net assets | 84 | 663 | 1,333 | 1,835 |
|---|
| Liabilities and net assets | - | 1,571 | 1,993 | 2,540 |
|---|