| Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Cash and deposits | - | 2,391 | 1,959 |
|---|
| Notes and accounts receivable - trade, and contract assets | - | 799 | 1,163 |
|---|
| Inventories | - | 112 | 112 |
|---|
| Other | - | 186 | 318 |
|---|
| Advance payments to suppliers | - | 1,582 | 1,773 |
|---|
| Other | - | 186 | 318 |
|---|
| Current assets | - | 5,069 | 5,324 |
|---|
| Allowance for doubtful accounts | - | -1 | -1 |
|---|
| Current assets | - | 5,069 | 5,324 |
|---|
| Buildings | - | 77 | 89 |
|---|
| Accumulated depreciation | - | -49 | -62 |
|---|
| Buildings, net | - | 27 | 27 |
|---|
| Tools, furniture and fixtures | - | 592 | 729 |
|---|
| Accumulated depreciation | - | -426 | -508 |
|---|
| Tools, furniture and fixtures, net | - | 165 | 221 |
|---|
| Leased assets | - | 7 | - |
|---|
| Accumulated depreciation | - | -5 | - |
|---|
| Leased assets, net | - | 2 | - |
|---|
| Property, plant and equipment | - | 194 | 248 |
|---|
| Property, plant and equipment | - | 194 | 248 |
|---|
| Goodwill | - | 287 | 559 |
|---|
| Software | - | 145 | 116 |
|---|
| Software | - | 145 | 116 |
|---|
| Intangible assets | - | 434 | 678 |
|---|
| Other | - | 2 | 3 |
|---|
| Intangible assets | - | 434 | 678 |
|---|
| Investment securities | - | 157 | 381 |
|---|
| Leasehold and guarantee deposits | - | 99 | 117 |
|---|
| Membership | - | 42 | 43 |
|---|
| Deferred tax assets | - | 111 | 93 |
|---|
| Deferred tax assets | - | 111 | 93 |
|---|
| Other | - | 41 | 19 |
|---|
| Other | - | 41 | 19 |
|---|
| Investments and other assets | - | 447 | 649 |
|---|
| Allowance for doubtful accounts | - | -3 | -3 |
|---|
| Investments and other assets | - | 447 | 649 |
|---|
| Non-current assets | - | 1,075 | 1,575 |
|---|
| Assets | - | 6,144 | 6,899 |
|---|
| Accounts payable - trade | - | 158 | 302 |
|---|
| Current portion of long-term borrowings | - | 93 | 91 |
|---|
| Accounts payable - other | - | 166 | 270 |
|---|
| Income taxes payable | - | 17 | 154 |
|---|
| Accrued expenses | - | 40 | 70 |
|---|
| Provision for bonuses | - | 98 | 84 |
|---|
| Advances received | - | 2,653 | 2,925 |
|---|
| Other | - | 101 | 96 |
|---|
| Provision for bonuses | - | 98 | 84 |
|---|
| Current liabilities | - | 3,326 | 3,994 |
|---|
| Income taxes payable | - | 17 | 154 |
|---|
| Other | - | 101 | 96 |
|---|
| Current liabilities | - | 3,326 | 3,994 |
|---|
| Long-term borrowings | - | 327 | 278 |
|---|
| Non-current liabilities | - | 373 | 340 |
|---|
| Asset retirement obligations | - | 11 | 20 |
|---|
| Long-term accounts payable - other | - | 34 | 34 |
|---|
| Other | - | - | 8 |
|---|
| Non-current liabilities | - | 373 | 340 |
|---|
| Liabilities | - | 3,699 | 4,334 |
|---|
| Share capital | - | 450 | 450 |
|---|
| Capital surplus | - | 1,671 | 1,577 |
|---|
| Capital surplus | - | 1,671 | 1,577 |
|---|
| Retained earnings | - | 567 | 743 |
|---|
| Retained earnings | - | 567 | 743 |
|---|
| Treasury shares | - | -300 | -266 |
|---|
| Shareholders' equity | - | 2,388 | 2,504 |
|---|
| Share acquisition rights | - | 12 | 17 |
|---|
| Deferred gains or losses on hedges | - | 16 | 17 |
|---|
| Foreign currency translation adjustment | - | - | 13 |
|---|
| Valuation and translation adjustments | - | 16 | 30 |
|---|
| Net assets | 2,440 | 2,445 | 2,565 |
|---|
| Share acquisition rights | - | 12 | 17 |
|---|
| Non-controlling interests | - | 29 | 14 |
|---|
| Net assets | 2,440 | 2,445 | 2,565 |
|---|
| Liabilities and net assets | - | 6,144 | 6,899 |
|---|