| Mar 31,
2019 | Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Cash and deposits | - | 514 | 488 | 750 | 680 | 938 |
|---|
| Notes receivable - trade | - | 86 | 55 | 53 | 50 | 67 |
|---|
| Accounts receivable - trade | - | 319 | 255 | 340 | 425 | 556 |
|---|
| Merchandise | - | 32 | 40 | 16 | 24 | 51 |
|---|
| Lease receivables | - | - | - | - | 92 | 93 |
|---|
| Other | - | 1 | 98 | 84 | 271 | 181 |
|---|
| Merchandise | - | 32 | 40 | 16 | 24 | 51 |
|---|
| Current assets | - | 973 | 965 | 1,273 | 1,449 | 1,793 |
|---|
| Costs on construction contracts in progress | - | 3 | 9 | 3 | 5 | 4 |
|---|
| Supplies | - | 1 | 1 | 2 | 3 | 3 |
|---|
| Prepaid expenses | - | 21 | 21 | 24 | 44 | 44 |
|---|
| Other | - | 1 | 98 | 84 | 271 | 181 |
|---|
| Current assets | - | 973 | 965 | 1,273 | 1,449 | 1,793 |
|---|
| Buildings, net | - | 341 | 305 | 141 | 140 | 138 |
|---|
| Buildings and structures, net | - | - | - | - | 397 | 489 |
|---|
| Structures, net | - | 237 | 191 | 181 | 251 | 348 |
|---|
| Machinery, equipment and vehicles, net | - | - | - | - | 65 | 81 |
|---|
| Machinery and equipment, net | - | 12 | 9 | 31 | 23 | 17 |
|---|
| Assets for rent, net | - | 2,597 | 1,779 | 2,190 | 3,485 | 4,655 |
|---|
| Vehicles, net | - | 39 | 26 | 17 | 42 | 61 |
|---|
| Land | - | 1,688 | 1,713 | 1,624 | 1,686 | 2,122 |
|---|
| Tools, furniture and fixtures, net | - | 20 | 13 | 10 | 10 | 11 |
|---|
| Other, net | - | - | - | - | 46 | 58 |
|---|
| Assets for rent, net | - | 2,597 | 1,779 | 2,190 | 3,485 | 4,655 |
|---|
| Property, plant and equipment | - | 4,997 | 4,087 | 4,233 | 5,679 | 7,405 |
|---|
| Land | - | 1,688 | 1,713 | 1,624 | 1,686 | 2,122 |
|---|
| Leased assets, net | - | 64 | 51 | 34 | 33 | 18 |
|---|
| Construction in progress | - | - | - | 5 | - | 28 |
|---|
| Property, plant and equipment | - | 4,997 | 4,087 | 4,233 | 5,679 | 7,405 |
|---|
| Other | - | 0 | 0 | 3 | 71 | 60 |
|---|
| Trademark right | - | 0 | 0 | 0 | 1 | 1 |
|---|
| Intangible assets | - | 50 | 42 | 35 | 71 | 60 |
|---|
| Software | - | 48 | 42 | 32 | 34 | 25 |
|---|
| Other | - | 0 | 0 | 3 | 71 | 60 |
|---|
| Intangible assets | - | 50 | 42 | 35 | 71 | 60 |
|---|
| Other | - | 54 | 53 | 71 | 119 | 157 |
|---|
| Shares of subsidiaries and associates | - | - | - | - | 108 | 108 |
|---|
| Allowance for doubtful accounts | - | -5 | -21 | -39 | -29 | -29 |
|---|
| Long-term loans receivable from subsidiaries and associates | - | - | - | - | - | 250 |
|---|
| Investments and other assets | - | 61 | 77 | 117 | 90 | 128 |
|---|
| Distressed receivables | - | 6 | 21 | 39 | 29 | 29 |
|---|
| Deferred tax assets | - | 7 | 24 | 45 | 29 | 42 |
|---|
| Other | - | 54 | 53 | 71 | 119 | 157 |
|---|
| Allowance for doubtful accounts | - | -5 | -21 | -39 | -29 | -29 |
|---|
| Investments and other assets | - | 61 | 77 | 117 | 90 | 128 |
|---|
| Non-current assets | - | 5,109 | 4,206 | 4,385 | 5,840 | 7,594 |
|---|
| Assets | - | 6,081 | 5,172 | 5,658 | 7,289 | 9,386 |
|---|
| Accounts payable - trade | - | 20 | 7 | 62 | 117 | 92 |
|---|
| Short-term borrowings | - | 750 | 600 | 600 | 800 | 800 |
|---|
| Current portion of long-term borrowings | - | 706 | 643 | 807 | 1,111 | 1,462 |
|---|
| Income taxes payable | - | 135 | 3 | 137 | - | 125 |
|---|
| Lease liabilities | - | 18 | 18 | 18 | 17 | 9 |
|---|
| Other | - | 21 | 124 | 1 | 115 | 257 |
|---|
| Accounts payable - other | - | 71 | 69 | 71 | 46 | 152 |
|---|
| Current liabilities | - | 1,782 | 1,537 | 1,757 | 2,143 | 2,736 |
|---|
| Accrued expenses | - | 5 | 4 | 6 | 6 | 8 |
|---|
| Income taxes payable | - | 135 | 3 | 137 | - | 125 |
|---|
| Advances received | - | 5 | 18 | 19 | 5 | 14 |
|---|
| Deposits received | - | 2 | 3 | 3 | 3 | 11 |
|---|
| Provision for bonuses | - | 27 | 27 | 33 | 36 | 50 |
|---|
| Other | - | 21 | 124 | 1 | 115 | 257 |
|---|
| Current liabilities | - | 1,782 | 1,537 | 1,757 | 2,143 | 2,736 |
|---|
| Long-term borrowings | - | 2,028 | 1,385 | 1,464 | 2,304 | 3,580 |
|---|
| Lease liabilities | - | 52 | 37 | 19 | 19 | 10 |
|---|
| Other | - | - | - | - | 52 | 43 |
|---|
| Asset retirement obligations | - | 19 | 17 | 17 | 33 | 33 |
|---|
| Non-current liabilities | - | 2,119 | 1,439 | 1,500 | 2,356 | 3,623 |
|---|
| Non-current liabilities | - | 2,119 | 1,439 | 1,500 | 2,356 | 3,623 |
|---|
| Liabilities | - | 3,901 | 2,976 | 3,258 | 4,499 | 6,359 |
|---|
| Share capital | - | 88 | 88 | 88 | 222 | 247 |
|---|
| Legal capital surplus | - | 78 | 78 | 78 | 212 | 237 |
|---|
| Other capital surplus | - | 229 | 229 | 229 | 229 | 229 |
|---|
| Capital surplus | - | 307 | 307 | 307 | 441 | 466 |
|---|
| Capital surplus | - | 307 | 307 | 307 | 441 | 466 |
|---|
| Legal retained earnings | - | 3 | 3 | 3 | 3 | 3 |
|---|
| Retained earnings brought forward | - | 1,783 | 1,799 | 2,003 | 2,149 | 2,458 |
|---|
| Retained earnings | - | 1,785 | 1,801 | 2,006 | 2,139 | 2,325 |
|---|
| Retained earnings | - | 1,785 | 1,801 | 2,006 | 2,139 | 2,325 |
|---|
| Treasury shares | - | - | - | - | -0 | -0 |
|---|
| Shareholders' equity | - | 2,180 | 2,196 | 2,401 | 2,802 | 3,038 |
|---|
| Net assets | 1,914 | 2,180 | 2,196 | 2,401 | 2,790 | 3,027 |
|---|
| Foreign currency translation adjustment | - | - | - | - | -13 | -11 |
|---|
| Valuation and translation adjustments | - | - | - | - | -13 | -11 |
|---|
| Net assets | 1,914 | 2,180 | 2,196 | 2,401 | 2,790 | 3,027 |
|---|
| Liabilities and net assets | - | 6,081 | 5,172 | 5,658 | 7,289 | 9,386 |
|---|