| 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 | Mar 31,
2025 |
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| Profit (loss) before income taxes | 659 | 559 | 544 | 596 | 402 | 582 | 583 | 527 | 796 | 1,063 | 750 | 998 | 687 |
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| Amortization of goodwill | 4 | 4 | 4 | 3 | - | - | 1 | 2 | 89 | 65 | 103 | 211 | 204 |
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| Depreciation | 204 | 190 | 175 | 102 | 85 | 87 | 82 | 65 | 192 | 177 | 199 | 232 | 176 |
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| Impairment losses | - | - | 33 | - | - | - | - | - | 278 | 15 | - | 209 | - |
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| Loss (gain) on sale of shares of subsidiaries and associates | - | -13 | - | - | - | - | - | - | - | - | 1 | - | -305 |
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| Increase (decrease) in allowance for doubtful accounts | -1 | 0 | 6 | -8 | 4 | -5 | 13 | -1 | -14 | -0 | -9 | -53 | -4 |
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| Increase (decrease) in provision for bonuses | 1 | -1 | -1 | 11 | 20 | -18 | -72 | - | 8 | -75 | - | 53 | 20 |
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| Increase (decrease) in provision for loss on orders received | - | - | - | - | - | - | - | - | - | - | - | 7 | -7 |
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| Interest and dividend income | -2 | -1 | -1 | -1 | -0 | -2 | -0 | -0 | -0 | -6 | -10 | -12 | -11 |
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| Commission expenses | - | - | - | - | - | - | - | - | - | - | 30 | 43 | 161 |
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| Interest expenses | 0 | 1 | 1 | 1 | 0 | - | - | 1 | 7 | 9 | 39 | 40 | 48 |
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| Foreign exchange losses (gains) | -10 | -3 | -1 | -0 | 0 | 0 | 0 | 1 | -0 | -12 | 18 | -30 | 4 |
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| Loss (gain) on valuation of derivatives | - | - | - | - | - | - | - | - | - | - | 24 | -47 | 3 |
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| Loss(Gain) on valuation of crypto assets | - | - | - | - | - | - | - | -4 | -96 | 5 | 39 | -132 | -20 |
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| Share of loss (profit) of entities accounted for using equity method | - | - | - | - | - | - | -38 | -41 | -28 | -19 | 0 | -9 | 70 |
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| Suubsidy for production cost | - | - | - | - | - | - | - | - | - | - | -9 | - | - |
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| Compensation income | - | - | - | - | - | - | - | - | - | - | -6 | - | - |
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| Subsidy income | - | - | - | - | - | - | - | - | - | - | - | -45 | - |
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| Point return income | - | - | - | - | - | - | - | - | - | - | -10 | -14 | -6 |
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| Head office relocation expenses | - | - | - | - | - | - | - | - | - | - | - | 93 | 84 |
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| Decrease (increase) in trade receivables | 89 | -79 | 55 | -7 | -12 | -31 | 20 | -17 | -18 | 162 | 161 | -605 | 1,061 |
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| Decrease (increase) in inventories | - | - | - | - | - | - | - | - | 62 | 66 | 358 | -356 | -153 |
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| Increase (decrease) in trade payables | 229 | 1 | -52 | -23 | 21 | 37 | -14 | 18 | -142 | -385 | -395 | -242 | -842 |
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| Increase (decrease) in accounts payable - other | -37 | 27 | -27 | 26 | -30 | -11 | -7 | 18 | -13 | -31 | 73 | 26 | 36 |
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| Increase (decrease) in deposits received | -78 | 8 | -1 | 166 | 181 | 114 | -249 | 248 | 673 | -320 | 11 | -101 | -18 |
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| Decrease (increase) in other assets | -66 | 67 | 33 | 6 | -11 | -0 | -102 | -49 | 99 | 41 | 133 | -104 | 46 |
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| Increase (decrease) in other liabilities | -0 | -36 | 92 | -47 | -5 | 48 | -39 | -28 | 89 | 65 | 47 | 60 | -158 |
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| Subtotal | 992 | 734 | 857 | 840 | 655 | 779 | 148 | 739 | 1,886 | 819 | 1,528 | 224 | 1,103 |
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| Interest and dividends received | 2 | 1 | 1 | 1 | 0 | 2 | 0 | 0 | 5 | 12 | 13 | 10 | 14 |
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| Commisson fee paid | - | - | - | - | - | - | - | - | - | - | -30 | -41 | -161 |
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| Interest paid | -0 | -1 | -1 | -1 | -0 | - | - | -1 | -7 | -9 | -39 | -39 | -48 |
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| Suubsidy for production cost received | - | - | - | - | - | - | - | - | - | - | 9 | - | - |
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| Proceeds from compensation | - | - | - | - | - | - | - | - | - | - | 6 | - | - |
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| Subsidies received | - | - | - | - | - | - | - | - | - | - | - | 45 | - |
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| Point return income received | - | - | - | - | - | - | - | - | - | - | 10 | 14 | 6 |
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| Income taxes paid | -165 | -291 | -179 | -226 | -189 | -90 | -175 | -142 | -222 | -405 | -486 | -319 | -709 |
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| Payments of relocation expenses | - | - | - | - | - | - | - | - | - | - | - | -9 | -69 |
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| Net cash provided by (used in) operating activities | 828 | 444 | 678 | 613 | 466 | 692 | -27 | 596 | 1,661 | 416 | 1,010 | -116 | 136 |
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| Payments for asset retirement obligations | -0 | - | - | -1 | - | - | - | - | -58 | -8 | - | -2 | -43 |
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| Purchase of property, plant and equipment | -93 | -57 | -39 | -6 | -53 | -61 | -59 | -48 | -176 | -21 | -117 | -35 | -192 |
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| Proceeds from sale of property, plant and equipment | - | - | - | - | - | - | - | - | - | - | 164 | - | 4 |
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| Purchase of intangible assets | -88 | -46 | -30 | -54 | -39 | -8 | -7 | -5 | -47 | -115 | -43 | -14 | -27 |
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| Purchase of investment securities | -41 | -10 | -42 | -20 | - | - | -100 | -31 | -50 | -120 | -1 | -23 | -95 |
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| Purchase of shares of subsidiaries resulting in change in scope of consolidation | - | - | - | - | - | - | - | -1,228 | - | -16 | -1,193 | - | - |
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| Payments for sale of shares of subsidiaries resulting in change in scope of consolidation | - | - | - | -78 | - | - | - | - | - | - | -19 | - | -81 |
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| Loan advances | - | -3 | -20 | -13 | -10 | - | -5 | - | - | - | -10 | -355 | -100 |
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| Payments of leasehold deposits | -5 | -11 | -12 | -14 | -9 | -3 | -0 | -98 | -103 | - | -18 | -133 | -69 |
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| Proceeds from refund of guarantee deposits | - | - | - | - | - | - | - | - | 50 | - | - | 2 | 201 |
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| Other, net | 1 | - | 0 | - | - | - | - | - | - | - | - | -0 | 0 |
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| Net cash provided by (used in) investing activities | -588 | 283 | -122 | -163 | -89 | -39 | -350 | -1,168 | -198 | -269 | -1,238 | -561 | 2,265 |
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| Net increase (decrease) in short-term borrowings | - | - | - | 300 | -300 | - | - | 30 | 220 | 60 | 665 | -144 | 875 |
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| Proceeds from long-term borrowings | - | 300 | - | - | - | - | - | 1,000 | 100 | 300 | 986 | 3,013 | - |
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| Repayments of long-term borrowings | -6 | -82 | -106 | -103 | -25 | - | - | - | - | - | -453 | -1,499 | -2,647 |
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| Repayments of lease liabilities | - | - | - | -1 | -1 | -1 | -1 | -1 | -24 | -3 | -3 | -3 | -2 |
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| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | - | - | - | - | - | - | - | - | - | - | - | -994 | - |
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| Purchase of treasury shares | - | -1,300 | -53 | -473 | - | - | -326 | -0 | -0 | -492 | - | -348 | -0 |
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| Dividends paid | -98 | -119 | -94 | -101 | -124 | -124 | -144 | -138 | -138 | -160 | -201 | -251 | -280 |
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| Other, net | - | - | - | - | - | - | -1 | 0 | -2 | -0 | 1 | -0 | 0 |
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| Net cash provided by (used in) financing activities | -104 | -1,198 | -252 | -376 | -449 | -125 | 513 | 885 | 15 | -464 | 994 | -226 | -2,054 |
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| Effect of exchange rate change on cash and cash equivalents | 10 | 3 | 1 | 0 | -0 | -0 | -0 | -1 | 0 | 0 | -29 | 14 | -1 |
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| Net increase (decrease) in cash and cash equivalents | 146 | -468 | 305 | 74 | -72 | 527 | 136 | 312 | 1,478 | -318 | 737 | -889 | 346 |
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