| Mar 31, 2017 | Mar 31, 2018 | Mar 31, 2019 | Mar 31, 2020 | Mar 31, 2021 | Mar 31, 2022 | Mar 31, 2023 | Mar 31, 2024 |
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Cash and deposits | - | 1,894 | 1,879 | 2,176 | 2,526 | 3,464 | 4,369 | 5,763 |
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Notes receivable - trade | - | - | - | - | - | 372 | 296 | 260 |
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Electronically recorded monetary claims - operating | - | 755 | 987 | 1,003 | 951 | 796 | 700 | 902 |
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Accounts receivable - trade | - | - | - | - | - | 1,014 | 1,016 | 820 |
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Accounts receivable from completed construction contracts | - | 2,675 | 2,392 | 3,620 | 4,322 | 2,796 | 2,049 | 1,987 |
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Contract assets | - | - | - | - | - | 1,266 | 698 | 978 |
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Merchandise and finished goods | - | 479 | 434 | 545 | 548 | 525 | 573 | 623 |
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Work in process | - | 177 | 147 | 126 | 101 | 136 | 308 | 376 |
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Raw materials and supplies | - | 103 | 127 | 140 | 115 | 138 | 140 | 136 |
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Consignment shipment | - | - | - | - | - | - | 8 | 4 |
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Other | - | 62 | 46 | 47 | 16 | 18 | 85 | 34 |
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Advance payments to suppliers | - | - | - | - | - | - | 25 | 66 |
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Current assets | - | 7,868 | 7,706 | 9,205 | 9,915 | 10,525 | 10,234 | 11,879 |
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Prepaid expenses | - | - | - | - | - | - | 14 | 18 |
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Other | - | 62 | 46 | 47 | 16 | 18 | 85 | 34 |
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Current assets | - | 7,868 | 7,706 | 9,205 | 9,915 | 10,525 | 10,234 | 11,879 |
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Buildings | - | - | - | - | - | - | 3,400 | 3,431 |
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Accumulated depreciation | - | - | - | - | - | - | -2,139 | -2,226 |
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Buildings, net | - | - | - | - | - | - | 1,261 | 1,205 |
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Buildings and structures | - | 3,348 | 3,399 | 3,415 | 3,486 | 3,516 | 3,842 | 3,883 |
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Accumulated depreciation | - | -2,153 | -2,226 | -2,292 | -2,309 | -2,390 | -2,478 | -2,575 |
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Buildings and structures, net | - | 1,195 | 1,173 | 1,124 | 1,177 | 1,125 | 1,363 | 1,307 |
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Structures | - | - | - | - | - | - | 426 | 436 |
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Accumulated depreciation | - | - | - | - | - | - | -324 | -334 |
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Structures, net | - | - | - | - | - | - | 102 | 102 |
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Machinery, equipment and vehicles | - | 8,203 | 8,216 | 8,091 | 8,086 | 8,250 | 8,287 | 8,305 |
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Accumulated depreciation | - | -6,845 | -6,861 | -6,775 | -6,833 | -6,957 | -7,070 | -7,171 |
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Machinery, equipment and vehicles, net | - | 1,358 | 1,355 | 1,316 | 1,254 | 1,292 | 1,217 | 1,134 |
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Machinery and equipment | - | - | - | - | - | - | 8,131 | 8,148 |
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Accumulated depreciation | - | - | - | - | - | - | -6,917 | -7,016 |
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Machinery and equipment, net | - | - | - | - | - | - | 1,214 | 1,133 |
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Land | - | 2,624 | 2,660 | 2,718 | 2,718 | 2,721 | 2,721 | 2,721 |
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Vehicles | - | - | - | - | - | - | 102 | 102 |
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Accumulated depreciation | - | - | - | - | - | - | -99 | -101 |
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Vehicles, net | - | - | - | - | - | - | 3 | 1 |
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Construction in progress | - | - | 22 | 356 | 167 | 33 | 1 | 13 |
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Tools, furniture and fixtures | - | - | - | - | - | - | 904 | 934 |
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Accumulated depreciation | - | - | - | - | - | - | -851 | -880 |
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Tools, furniture and fixtures, net | - | - | - | - | - | - | 54 | 54 |
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Other | - | 766 | 875 | 875 | 955 | 915 | 929 | 957 |
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Accumulated depreciation | - | -720 | -761 | -810 | -834 | -840 | -873 | -885 |
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Other, net | - | 45 | 114 | 65 | 121 | 76 | 56 | 72 |
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Land | - | 2,624 | 2,660 | 2,718 | 2,718 | 2,721 | 2,721 | 2,721 |
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Property, plant and equipment | - | 5,223 | 5,302 | 5,578 | 5,437 | 5,247 | 5,359 | 5,248 |
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Leased assets | - | - | - | - | - | - | 24 | 22 |
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Accumulated depreciation | - | - | - | - | - | - | -21 | -4 |
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Leased assets, net | - | - | - | - | - | - | 2 | 19 |
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Construction in progress | - | - | 22 | 356 | 167 | 33 | 1 | 13 |
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Property, plant and equipment | - | 5,223 | 5,302 | 5,578 | 5,437 | 5,247 | 5,359 | 5,248 |
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Leasehold interests in land | - | - | - | - | - | - | 5 | 5 |
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Software | - | 105 | 123 | 97 | 113 | 67 | 49 | 29 |
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Software | - | 105 | 123 | 97 | 113 | 67 | 49 | 29 |
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Other | - | 26 | 21 | 21 | 21 | 21 | 21 | 21 |
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Right to use water facilities | - | - | - | - | - | - | 0 | 0 |
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Intangible assets | - | 130 | 144 | 118 | 134 | 88 | 70 | 51 |
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Other | - | 26 | 21 | 21 | 21 | 21 | 21 | 21 |
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Intangible assets | - | 130 | 144 | 118 | 134 | 88 | 70 | 51 |
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Investment securities | - | 358 | 423 | 359 | 328 | 368 | 471 | 757 |
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Investments in capital of subsidiaries and associates | - | - | - | - | - | - | 111 | 111 |
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Deferred tax assets | - | - | 152 | 290 | 258 | 109 | 67 | 53 |
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Long-term prepaid expenses | - | - | - | - | - | - | 17 | 11 |
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Other | - | 306 | 239 | 232 | 170 | 163 | 174 | 182 |
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Deferred tax assets | - | - | 152 | 290 | 258 | 109 | 67 | 53 |
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Allowance for doubtful accounts | - | -44 | -9 | -6 | -5 | -50 | -52 | -52 |
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Other | - | 306 | 239 | 232 | 170 | 163 | 174 | 182 |
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Investments and other assets | - | 756 | 804 | 876 | 750 | 590 | 660 | 940 |
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Allowance for doubtful accounts | - | -44 | -9 | -6 | -5 | -50 | -52 | -52 |
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Investments and other assets | - | 756 | 804 | 876 | 750 | 590 | 660 | 940 |
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Non-current assets | - | 6,109 | 6,251 | 6,571 | 6,321 | 5,925 | 6,090 | 6,238 |
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Assets | - | 13,977 | 13,957 | 15,777 | 16,236 | 16,451 | 16,324 | 18,117 |
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Notes payable - trade | - | - | - | - | - | - | 629 | 755 |
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Notes and accounts payable - trade | - | 854 | 882 | 996 | 891 | 889 | 901 | 1,045 |
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Accounts payable - trade | - | - | - | - | - | - | 275 | 297 |
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Accounts payable for construction contracts | - | 354 | 520 | 582 | 585 | 533 | 489 | 545 |
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Accounts payable for construction contracts | - | 354 | 520 | 582 | 585 | 533 | 489 | 545 |
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Contract liabilities | - | - | - | - | - | 174 | 216 | 290 |
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Contract liabilities | - | - | - | - | - | 174 | 216 | 290 |
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Short-term borrowings | - | - | - | 50 | 50 | 50 | 50 | 50 |
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Short-term borrowings | - | - | - | 50 | 50 | 50 | 50 | 50 |
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Current portion of long-term borrowings | - | 1,037 | 914 | 756 | 446 | 423 | 507 | 390 |
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Current portion of long-term borrowings | - | 1,037 | 914 | 756 | 446 | 423 | 507 | 390 |
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Income taxes payable | - | 442 | 300 | 464 | 423 | 277 | 41 | 376 |
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Lease liabilities | - | - | - | - | - | - | 1 | 5 |
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Provision for bonuses | - | 245 | 225 | 277 | 276 | 281 | 189 | 335 |
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Accounts payable - other | - | - | - | - | - | - | 117 | 152 |
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Provision for warranties for completed construction | - | 39 | 23 | 24 | 24 | 17 | 6 | 3 |
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Accrued expenses | - | - | - | - | - | - | 115 | 137 |
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Provision for loss on construction contracts | - | 2 | 10 | 5 | 11 | 9 | 6 | 6 |
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Income taxes payable | - | 442 | 300 | 464 | 423 | 277 | 41 | 376 |
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Notes payable - facilities | - | 131 | 218 | 146 | 300 | 56 | 40 | 56 |
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Provision for bonuses | - | 245 | 225 | 277 | 276 | 281 | 189 | 335 |
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Other | - | 366 | 341 | 458 | 372 | 383 | 258 | 411 |
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Provision for warranties for completed construction | - | 39 | 23 | 24 | 24 | 17 | 6 | 3 |
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Current liabilities | - | 3,547 | 3,583 | 3,956 | 3,738 | 3,094 | 2,701 | 3,507 |
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Provision for loss on construction contracts | - | 2 | 10 | 5 | 11 | 9 | 6 | 6 |
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Deposits received | - | - | - | - | - | - | 14 | 126 |
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Notes payable - facilities | - | 131 | 218 | 146 | 300 | 56 | 40 | 56 |
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Other | - | 366 | 341 | 458 | 372 | 383 | 258 | 411 |
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Current liabilities | - | 3,547 | 3,583 | 3,956 | 3,738 | 3,094 | 2,701 | 3,507 |
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Long-term borrowings | - | 2,092 | 1,248 | 645 | 536 | 550 | 381 | 529 |
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Lease liabilities | - | - | - | - | - | - | 2 | 16 |
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Provision for retirement benefits for directors (and other officers) | - | 154 | 150 | 164 | 158 | 173 | 187 | 183 |
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Guarantee deposits received | - | - | - | - | - | - | 13 | 11 |
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Provision for compensation for health damage from asbestos | - | 51 | 98 | 95 | 125 | 107 | 147 | 118 |
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Provision for retirement benefits for directors (and other officers) | - | 154 | 150 | 164 | 158 | 173 | 187 | 183 |
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Deferred tax liabilities for land revaluation | - | 423 | 423 | 371 | 371 | 423 | 423 | 423 |
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Provision for compensation for health damage from asbestos | - | 51 | 98 | 95 | 125 | 107 | 147 | 118 |
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Other | - | 31 | 27 | 25 | 26 | 23 | 15 | 27 |
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Deferred tax liabilities for land revaluation | - | 423 | 423 | 371 | 371 | 423 | 423 | 423 |
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Non-current liabilities | - | 2,751 | 1,992 | 1,300 | 1,216 | 1,276 | 1,153 | 1,279 |
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Non-current liabilities | - | 2,751 | 1,992 | 1,300 | 1,216 | 1,276 | 1,153 | 1,279 |
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Liabilities | - | 6,298 | 5,575 | 5,256 | 4,955 | 4,370 | 3,854 | 4,786 |
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Share capital | - | 744 | 744 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 |
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Legal capital surplus | - | - | - | - | - | - | 939 | 939 |
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Other capital surplus | - | - | - | - | - | - | 3 | 5 |
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Capital surplus | - | 482 | 482 | 939 | 939 | 939 | 942 | 944 |
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Capital surplus | - | 482 | 482 | 939 | 939 | 939 | 942 | 944 |
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Legal retained earnings | - | - | - | - | - | - | 95 | 95 |
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General reserve | - | - | - | - | - | - | 1,000 | 1,000 |
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Retained earnings brought forward | - | - | - | - | - | - | 8,428 | 9,105 |
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Retained earnings | - | 5,580 | 6,331 | 7,551 | 8,270 | 9,112 | 9,514 | 10,169 |
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Retained earnings | - | 5,580 | 6,331 | 7,551 | 8,270 | 9,112 | 9,514 | 10,169 |
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Treasury shares | - | -3 | -3 | -3 | -3 | -3 | -50 | -38 |
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Shareholders' equity | - | 6,804 | 7,555 | 9,688 | 10,407 | 11,248 | 11,606 | 12,274 |
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Revaluation reserve for land | - | 789 | 789 | 841 | 841 | 789 | 789 | 789 |
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Valuation difference on available-for-sale securities | - | 121 | 85 | 43 | 88 | 92 | 115 | 305 |
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Valuation and translation adjustments | - | 875 | 828 | 833 | 874 | 833 | 864 | 1,056 |
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Foreign currency translation adjustment | - | -35 | -47 | -52 | -55 | -48 | -40 | -38 |
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Valuation and translation adjustments | - | 875 | 828 | 833 | 874 | 833 | 864 | 1,056 |
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Net assets | 6,406 | 7,679 | 8,382 | 10,520 | 11,281 | 12,081 | 12,470 | 13,331 |
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Liabilities and net assets | - | 13,977 | 13,957 | 15,777 | 16,236 | 16,451 | 16,324 | 18,117 |
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