| Mar 31,
2013 | Mar 31,
2014 | Mar 31,
2015 | Mar 31,
2016 | Mar 31,
2017 | Mar 31,
2018 | Mar 31,
2019 | Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Profit (loss) before income taxes | 1,248 | 1,465 | 1,643 | 1,797 | 1,052 | 1,558 | 1,810 | 1,688 | 890 | 3,495 | 4,063 | 4,506 |
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| Depreciation | 332 | 378 | 487 | 605 | 654 | 669 | 704 | 724 | 729 | 709 | 737 | 707 |
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| Impairment losses | 127 | - | - | 83 | 391 | 23 | 108 | 311 | 2,021 | 44 | 55 | 41 |
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| Amortization of goodwill | 15 | 4 | 2 | - | 15 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
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| Gain on bargain purchase | - | - | - | - | - | - | - | - | - | - | - | -7 |
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| Increase (decrease) in allowance for doubtful accounts | 5 | 5 | 6 | -1 | 4 | -3 | -6 | 25 | 4 | -6 | -2 | 1 |
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| Increase (decrease) in provision for bonuses | 26 | 106 | 22 | - | 38 | -9 | 21 | 144 | -10 | 362 | -40 | 25 |
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| Increase (decrease) in retirement benefit liability | - | 74 | 48 | 46 | 59 | 46 | 81 | 116 | 143 | 85 | 79 | 42 |
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| Share-based payment expenses | - | - | - | - | - | - | - | - | - | - | 3 | 26 |
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| Gain on reversal of asset retirement obligations | - | - | - | - | - | - | - | - | -11 | -35 | -21 | -18 |
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| Arrangement fee | - | - | - | - | - | - | - | - | - | - | - | 70 |
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| Interest and dividend income | -16 | -28 | -68 | -58 | -88 | -111 | -105 | -99 | -90 | -77 | -78 | -74 |
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| Interest expenses | 23 | 27 | 41 | 39 | 50 | 52 | 57 | 56 | 58 | 69 | 71 | 68 |
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| Loss (gain) on sale of non-current assets | - | - | - | - | -0 | - | 0 | - | -4 | -149 | -356 | 1 |
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| Loss on retirement of non-current assets | 0 | 1 | 8 | 4 | 3 | 3 | 2 | 1 | 4 | 0 | 3 | 1 |
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| Decrease (increase) in trade receivables | -1 | -13 | -19 | 16 | -5 | -31 | 10 | -5 | -14 | 20 | 8 | -34 |
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| Decrease (increase) in inventories | 35 | -68 | -38 | 44 | -10 | -40 | 20 | 18 | -56 | 104 | 8 | 9 |
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| Decrease (increase) in accounts receivable - other | -129 | -259 | -246 | -185 | 208 | -533 | -297 | -37 | -592 | 301 | -555 | -186 |
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| Decrease (increase) in consumption taxes refund receivable | -4 | -41 | -90 | -81 | -14 | -50 | -2 | -2 | 90 | 13 | -13 | -5 |
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| Increase (decrease) in trade payables | 2 | 56 | 26 | -19 | 24 | 14 | -31 | -11 | 19 | -54 | 21 | 11 |
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| Increase (decrease) in accounts payable - other, and accrued expenses | 80 | -49 | 136 | 85 | 205 | 447 | -15 | 18 | -10 | -56 | 252 | 1,247 |
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| Increase (decrease) in accrued consumption taxes | -5 | -18 | 51 | -3 | 98 | -87 | 3 | 43 | 43 | -17 | -51 | -31 |
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| Increase (decrease) in advances received | -22 | 190 | 260 | 246 | 48 | 229 | -2 | -14 | -118 | -113 | -21 | -130 |
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| Decrease (increase) in other current assets | 39 | -107 | -51 | -19 | 9 | -79 | 80 | 38 | -39 | 89 | -79 | 2 |
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| Decrease (increase) in other non-current assets | - | - | - | -0 | 18 | 8 | -16 | 153 | 158 | 208 | 117 | 71 |
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| Increase (decrease) in other current liabilities | 29 | -42 | 3 | 10 | 32 | 128 | 11 | -73 | 28 | -5 | 16 | 150 |
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| Increase (decrease) in other non-current liabilities | - | - | -19 | 5 | 12 | 2 | 28 | 3 | 3 | 6 | 3 | 3 |
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| Subtotal | 1,843 | 1,697 | 2,083 | 2,499 | 2,688 | 2,291 | 2,492 | 3,132 | 3,325 | 5,027 | 4,252 | 6,524 |
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| Interest and dividends received | 3 | 7 | 46 | 18 | 24 | 22 | 17 | 9 | 17 | 0 | 0 | 0 |
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| Interest paid | -21 | -26 | -39 | -37 | -51 | -50 | -55 | -60 | -59 | -71 | -71 | -65 |
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| Income taxes refund (paid) | - | - | - | - | -783 | -398 | -624 | -760 | -814 | -1,072 | -1,446 | -860 |
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| Net cash provided by (used in) operating activities | 1,173 | 1,038 | 1,294 | 1,804 | 1,878 | 1,866 | 1,830 | 2,321 | 2,469 | 3,884 | 2,735 | 5,598 |
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| Proceeds from sale of property, plant and equipment | - | 0 | - | 12 | 0 | - | 0 | - | 5 | 461 | 996 | - |
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| Purchase of property, plant and equipment | -866 | -2,199 | -2,937 | -1,971 | -2,023 | -1,854 | -1,878 | -866 | -635 | -687 | -870 | -291 |
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| Purchase of intangible assets | -0 | -4 | -5 | -2 | -133 | -17 | -4 | -34 | -9 | -5 | -13 | -2 |
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| Proceeds from refund of guarantee deposits | 14 | 43 | 15 | 42 | 52 | 26 | 14 | 26 | 19 | 45 | 47 | - |
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| Payments of guarantee deposits | -82 | -173 | -152 | -188 | -116 | -156 | -72 | -52 | -63 | -38 | -9 | -10 |
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| Expense of premium | - | - | - | - | - | - | - | - | - | - | - | -1 |
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| Proceeds from collection of long-term loans receivable | 99 | 89 | 146 | 191 | 202 | 219 | 272 | 264 | 265 | 278 | 261 | 282 |
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| Long-term loan advances | -391 | -1,082 | -1,081 | -504 | -515 | -334 | -361 | -120 | -110 | -35 | -46 | - |
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| Subsidies received | - | - | - | - | - | - | 1,059 | 1,208 | 443 | 449 | 139 | 11 |
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| Proceeds from purchase of shares of subsidiaries resulting in change in scope of consolidation | - | - | - | - | - | - | - | - | - | - | - | 8 |
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| Other, net | - | - | - | - | - | -8 | 32 | -25 | -19 | -73 | -94 | -3 |
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| Net cash provided by (used in) investing activities | -1,268 | -3,639 | -3,959 | -2,449 | -3,305 | -1,293 | -940 | 419 | 191 | 413 | 412 | -6 |
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| Proceeds from long-term borrowings | 1,800 | 3,000 | 6,800 | 4,846 | 5,062 | 1,850 | 4,000 | 700 | 4,400 | 6,031 | 3,450 | 200 |
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| Repayments of long-term borrowings | -1,026 | -1,510 | -2,747 | -2,958 | -3,349 | -3,536 | -2,799 | -2,201 | -1,906 | -3,714 | -3,499 | -3,675 |
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| Arrangement fee paid | - | - | - | - | - | - | - | - | - | - | - | -70 |
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| Proceeds from disposal of treasury shares | - | - | - | - | 369 | 269 | 580 | 81 | - | - | 38 | 74 |
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| Purchase of treasury shares | - | -0 | - | -1,208 | - | - | - | -107 | - | - | -712 | - |
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| Dividends paid | -252 | -263 | -298 | -334 | -436 | -218 | -305 | -322 | -339 | -338 | -390 | -508 |
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| Net cash provided by (used in) financing activities | 514 | 1,221 | 3,749 | 1,553 | 1,646 | -136 | 1,475 | -3,349 | 2,155 | 1,978 | -1,113 | -3,978 |
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| Effect of exchange rate change on cash and cash equivalents | - | - | - | - | - | 1 | -4 | -0 | -1 | - | - | - |
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| Net increase (decrease) in cash and cash equivalents | 420 | -1,380 | 1,083 | 908 | 219 | 438 | 2,361 | -610 | 4,814 | 6,276 | 2,034 | 1,614 |
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