| 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 |
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| Profit (loss) before income taxes | 18 | -123 | 547 | 162 | 99 | 297 | 207 | 613 | 270 | 335 | -369 | 500 |
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| Depreciation | 26 | 39 | 99 | 189 | 258 | 316 | 300 | 379 | 366 | 262 | 272 | 276 |
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| Increase (decrease) in provision for bonuses | 16 | 3 | 41 | -22 | 1 | 8 | 0 | -4 | -1 | -10 | 17 | -0 |
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| Increase (decrease) in reserve for incentive fees | 19 | -20 | 12 | -1 | -11 | -1 | -0 | 19 | -2 | -17 | 21 | -11 |
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| Interest and dividend income | -1 | -1 | -1 | -0 | -0 | -1 | -1 | -1 | -1 | -4 | -0 | -0 |
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| Interest expenses | 9 | 17 | 27 | 79 | 108 | 103 | 58 | 70 | 65 | 58 | 54 | 63 |
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| Share of loss (profit) of entities accounted for using equity method | - | - | - | - | - | - | 2 | 24 | 114 | 155 | 76 | 63 |
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| Loss (gain) on sale of investment securities | 2 | - | - | - | - | - | - | -83 | - | -22 | -606 | 7 |
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| Loss (gain) on sale of shares of subsidiaries and associates | - | - | - | - | - | - | - | -944 | - | - | 1 | - |
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| Loss (gain) on valuation of investment securities | 17 | 10 | - | - | - | - | 69 | 70 | - | - | 101 | - |
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| Subsidy income | - | - | - | - | - | - | - | - | - | - | -20 | -19 |
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| Loss on tax purpose reduction entry of non-current assets | - | - | - | - | - | - | - | - | 100 | - | 20 | 19 |
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| Other extraordinary loss (income) | - | - | - | - | - | - | - | - | - | - | -18 | - |
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| Decrease (increase) in guarantee deposits | 216 | 812 | 272 | 295 | -327 | 62 | 190 | 394 | -718 | -1,252 | 451 | -84 |
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| Decrease (increase) in accounts receivable - other | 133 | 154 | -195 | 51 | -71 | -197 | 81 | -49 | -18 | -211 | -340 | -350 |
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| Decrease (increase) in consumption taxes refund receivable | - | - | 25 | -104 | -120 | 160 | -80 | 64 | 119 | 7 | -6 | 1 |
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| Increase (decrease) in accrued consumption taxes | - | - | - | - | - | - | - | 71 | 39 | -98 | 24 | 20 |
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| Increase (decrease) in accounts payable - other | -92 | -147 | 121 | -45 | 53 | 135 | 601 | -372 | -173 | 74 | -113 | 250 |
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| Increase (decrease) in accrued expenses | 5 | -5 | 16 | 0 | 6 | 5 | -7 | 11 | -9 | -9 | 3 | 3 |
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| Increase (decrease) in deposits received | -32 | -1 | 109 | -16 | 1 | 4 | -6 | 1 | 8 | 10 | 12 | -27 |
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| Increase (decrease) in long-term deposits received | - | - | - | - | - | 367 | 186 | - | 740 | - | 200 | - |
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| Increase (decrease) in guarantee deposits received | - | - | - | - | - | - | - | - | - | 98 | 593 | -258 |
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| Decrease (increase) in futures transaction margin (debit) | -227 | 1 | 94 | -227 | 193 | -130 | 88 | -694 | 679 | 32 | 15 | 57 |
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| Net decrease (increase) in lease receivables and investments in leases | - | - | - | - | - | - | - | - | - | - | 19 | -3 |
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| Increase (decrease) in lease liabilities | - | - | - | - | - | - | - | - | - | - | - | 23 |
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| Other, net | 5 | 2 | -197 | 224 | 251 | 391 | -113 | 257 | -369 | 358 | 46 | 88 |
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| Subtotal | 125 | 446 | 1,103 | 716 | 470 | 1,250 | 22 | 610 | 1,325 | -306 | 453 | 618 |
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| Interest and dividends received | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 4 | 0 | 0 |
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| Interest paid | -11 | -17 | -20 | -77 | -99 | -116 | -56 | -70 | -65 | -56 | -55 | -62 |
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| Income taxes paid | -29 | -46 | -21 | -163 | -48 | -334 | -180 | -51 | -340 | -119 | -159 | -35 |
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| Subsidies received | - | - | - | - | - | - | - | - | - | - | - | 19 |
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| Income taxes refund | 0 | - | 25 | 96 | 45 | 0 | 151 | 91 | - | 34 | - | 70 |
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| Net cash provided by (used in) operating activities | 87 | 362 | 1,086 | 572 | 367 | 801 | -62 | 670 | 921 | -443 | 239 | 610 |
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| Purchase of investment securities | -17 | -8 | -161 | -139 | -15 | -150 | -228 | -476 | -111 | -6 | -370 | -301 |
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| Proceeds from sale of investment securities | 5 | - | - | - | - | - | - | 199 | - | 22 | 650 | - |
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| Proceeds from redemption of investment securities | 188 | 15 | 3 | 6 | 12 | 103 | 16 | 12 | 162 | 0 | 82 | 82 |
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| Purchase of property, plant and equipment | -135 | -414 | -1,088 | -2,779 | -1,370 | -884 | -1,386 | -1,022 | -470 | -191 | -150 | -283 |
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| Proceeds from sale of property, plant and equipment | - | - | - | - | - | 910 | 1,130 | 0 | 895 | - | - | - |
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| Purchase of intangible assets | -1 | -0 | -9 | -72 | -10 | -16 | -11 | -1 | -4 | -24 | -23 | -13 |
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| Proceeds from refund of guarantee deposits | 6 | 40 | - | - | 35 | 3 | - | 4 | 4 | - | 2 | 0 |
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| Short-term loan advances | - | - | - | - | - | - | - | - | - | -80 | -70 | - |
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| Proceeds from collection of short-term loans receivable | - | - | - | - | - | - | - | - | - | 10 | 140 | - |
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| Other, net | - | - | - | - | - | -0 | 0 | -2 | -2 | - | -2 | -0 |
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| Net cash provided by (used in) investing activities | -440 | -339 | -1,293 | -3,080 | -1,247 | -39 | -479 | -1,693 | 1,154 | -269 | 259 | -516 |
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| Proceeds from short-term borrowings | 540 | 152 | 410 | 523 | 503 | 681 | 1,768 | 1,565 | 931 | 478 | 977 | 3,903 |
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| Repayments of short-term borrowings | -302 | -301 | -384 | -412 | -567 | -445 | -1,106 | -712 | -2,673 | -505 | -1,072 | -2,923 |
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| Proceeds from long-term borrowings | 231 | 328 | 740 | 2,737 | 1,831 | 2,644 | 135 | 316 | 228 | - | 100 | 200 |
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| Repayments of long-term borrowings | -203 | -168 | -112 | -59 | -1,125 | -3,652 | -321 | -228 | -927 | -265 | -237 | -249 |
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| Proceeds from issuance of bonds | - | - | - | - | - | - | - | - | 595 | 500 | 97 | - |
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| Redemption of bonds | -43 | - | - | - | - | - | -40 | - | -10 | -20 | -20 | -40 |
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| Purchase of treasury shares | - | - | - | -0 | -0 | - | - | -123 | - | - | - | -150 |
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| Dividends paid | -11 | -0 | -1 | -154 | -53 | -91 | -144 | -145 | -76 | -38 | -38 | -90 |
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| Dividends paid to non-controlling interests | - | - | - | - | - | -139 | -51 | - | -13 | -17 | -18 | -13 |
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| Net cash provided by (used in) financing activities | 378 | -0 | 644 | 2,634 | 2,609 | -1,004 | 240 | 669 | -1,638 | 134 | -212 | 638 |
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| Effect of exchange rate change on cash and cash equivalents | 0 | -0 | 0 | -0 | - | -0 | 0 | -0 | - | 0 | 0 | 0 |
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| Net increase (decrease) in cash and cash equivalents | 25 | 23 | 437 | 126 | 1,729 | -242 | -300 | -355 | 438 | -578 | 287 | 732 |
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