| Mar 31,
2019 | Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 |
|---|
| Cash and deposits | - | 25,676 | 17,376 | 22,698 | 14,192 |
|---|
| Notes and accounts receivable - trade | - | 9,254 | 9,322 | 9,467 | 8,873 |
|---|
| Railway fares receivables | - | 13,485 | 13,380 | 12,857 | 12,833 |
|---|
| Inventories | - | 4,560 | 5,248 | 5,262 | 5,374 |
|---|
| Accounts receivable - other | - | 7,505 | 8,095 | 7,102 | 6,403 |
|---|
| Consumption taxes refund receivable | - | - | 44 | 1,468 | 74 |
|---|
| Other | - | 179 | 252 | 173 | 122 |
|---|
| Allowance for doubtful accounts | - | -15 | -18 | -11 | -12 |
|---|
| Current assets | - | 53,381 | 49,276 | 55,043 | 45,811 |
|---|
| Buildings and structures, net | - | 149,023 | 149,256 | 148,129 | 167,580 |
|---|
| Machinery, equipment and vehicles, net | - | 116,143 | 116,426 | 114,926 | 114,932 |
|---|
| Land | - | 35,168 | 36,330 | 37,234 | 37,884 |
|---|
| Construction in progress | - | 7,244 | 5,076 | 20,403 | 6,533 |
|---|
| Other, net | - | 10,161 | 8,473 | 9,225 | 11,638 |
|---|
| Property, plant and equipment | - | 317,741 | 315,562 | 329,918 | 338,570 |
|---|
| Intangible assets | - | 3,682 | 3,610 | 3,064 | 3,955 |
|---|
| Investment securities | - | 960 | 1,066 | 941 | 1,218 |
|---|
| Deferred tax assets | - | 5,557 | 5,538 | 6,659 | 8,811 |
|---|
| Other | - | 4,784 | 4,907 | 4,858 | 5,215 |
|---|
| Allowance for doubtful accounts | - | -62 | -53 | -50 | -49 |
|---|
| Investments and other assets | - | 22,676 | 22,654 | 23,639 | 27,944 |
|---|
| Non-current assets | - | 328,292 | 326,053 | 341,961 | 356,434 |
|---|
| Assets | - | 381,674 | 375,329 | 397,005 | 402,246 |
|---|
| Notes and accounts payable - trade | - | 1,076 | 2,089 | 1,701 | 1,775 |
|---|
| Short-term borrowings | - | 1,265 | 1,430 | 960 | 670 |
|---|
| Current portion of long-term borrowings | - | 8,324 | 6,750 | 5,942 | 4,779 |
|---|
| Accounts payable - other | - | 33,846 | 22,487 | 24,379 | 27,958 |
|---|
| Income taxes payable | - | 1,950 | 114 | 378 | 435 |
|---|
| Accrued consumption taxes | - | 762 | 455 | 662 | 463 |
|---|
| Advances received | - | 6,454 | 11,286 | 12,187 | 13,489 |
|---|
| Provision for bonuses | - | 3,397 | 3,264 | 3,534 | 3,376 |
|---|
| Provision for environmental measures | - | 386 | 471 | 889 | 166 |
|---|
| Other | - | 9,481 | 6,978 | 5,790 | 5,480 |
|---|
| Current liabilities | - | 73,916 | 60,765 | 62,823 | 67,307 |
|---|
| Bonds payable | - | - | - | 20,000 | 20,000 |
|---|
| Long-term borrowings | - | 63,020 | 74,269 | 79,327 | 90,547 |
|---|
| Deferred tax liabilities | - | 3 | 22 | 4 | - |
|---|
| Retirement benefit liability | - | 40,377 | 37,663 | 38,895 | 37,960 |
|---|
| Provision for retirement benefits for directors (and other officers) | - | 397 | 351 | 394 | 416 |
|---|
| Provision for environmental measures | - | 832 | 701 | 32 | 19 |
|---|
| Provision for loss on liquidation of subsidiaries and associates | - | - | - | 421 | - |
|---|
| Liabilities from application of equity method | - | - | - | 336 | - |
|---|
| Guarantee deposits received | - | 29,690 | 28,697 | 27,108 | 26,638 |
|---|
| Other | - | 2,490 | 1,937 | 1,657 | 1,461 |
|---|
| Non-current liabilities | - | 233,477 | 240,203 | 262,558 | 268,412 |
|---|
| Liabilities | - | 307,394 | 300,969 | 325,381 | 335,719 |
|---|
| Share capital | - | 19,000 | 19,000 | 19,000 | 19,000 |
|---|
| Capital surplus | - | 15,300 | 15,300 | 15,300 | 15,300 |
|---|
| Retained earnings | - | 39,989 | 39,996 | 37,344 | 32,055 |
|---|
| Shareholders' equity | - | 74,290 | 74,296 | 71,645 | 66,356 |
|---|
| Valuation difference on available-for-sale securities | - | -10 | 63 | -21 | 171 |
|---|
| Remeasurements of defined benefit plans | - | 4,792 | 4,433 | 4,245 | 3,792 |
|---|
| Valuation and translation adjustments | - | -10 | 63 | -21 | 171 |
|---|
| Non-controlling interests | - | 5,057 | 5,243 | 5,369 | 5,477 |
|---|
| Net assets | 70,363 | 74,280 | 74,360 | 71,624 | 66,527 |
|---|
| Liabilities and net assets | - | 381,674 | 375,329 | 397,005 | 402,246 |
|---|