| 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 |
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| Profit (loss) before income taxes | 152 | 90 | 272 | 817 | 177 | 237 | 155 | 108 | -294 | -517 | 92 |
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| Depreciation | 646 | 678 | 720 | 727 | 778 | 796 | 765 | 799 | 803 | 774 | 692 |
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| Impairment losses | 17 | - | - | - | 14 | - | - | - | - | 223 | - |
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| Amortization of goodwill | - | - | - | - | - | - | - | 38 | 38 | 38 | 38 |
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| Increase (decrease) in provision for retirement benefits for directors (and other officers) | -13 | 6 | -5 | -1 | -4 | -4 | 8 | 9 | 10 | 15 | 1 |
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| Increase (decrease) in provision for bonuses | 12 | -8 | 6 | 23 | 14 | -1 | -10 | 1 | -3 | 3 | -1 |
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| Increase (decrease) in provision for bonuses for directors (and other officers) | 3 | 1 | -2 | 2 | 0 | -0 | 5 | -1 | 0 | 2 | 6 |
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| Increase (decrease) in retirement benefit liability | - | 1,174 | -66 | -20 | 4 | -77 | -17 | 6 | -51 | -59 | -65 |
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| Increase (decrease) in allowance for doubtful accounts | 6 | -35 | 0 | -3 | -1 | 14 | -22 | 4 | -1 | 4 | -6 |
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| Interest and dividend income | -69 | -69 | -72 | -83 | -86 | -84 | -90 | -100 | -154 | -85 | -98 |
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| Interest expenses | 127 | 119 | 108 | 104 | 96 | 85 | 83 | 122 | 127 | 125 | 118 |
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| Loss (gain) on valuation of investment securities | - | - | 4 | 3 | 4 | - | - | - | 2 | 16 | 4 |
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| Loss (gain) on sale of investment securities | - | - | -20 | - | -13 | - | -2 | - | -292 | - | -59 |
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| Loss (gain) on sale of property, plant and equipment | -38 | -37 | -116 | -52 | -14 | -3 | -2 | 0 | 1 | -15 | -14 |
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| Loss on retirement of property, plant and equipment | 78 | 82 | 1 | 11 | 10 | 2 | 3 | 37 | 10 | 3 | 2 |
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| Loss on tax purpose reduction entry of non-current assets | 34 | 12 | 22 | 25 | 47 | 12 | 41 | 12 | 56 | 31 | 26 |
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| Decrease (increase) in trade receivables | 67 | -176 | 181 | 428 | -743 | -826 | 514 | 26 | 291 | -773 | 1,047 |
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| Decrease (increase) in inventories | 48 | 104 | -47 | 1 | -19 | -356 | 582 | -364 | -30 | 389 | -307 |
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| Decrease (increase) in other current assets | -12 | -82 | 115 | -122 | -175 | 250 | -37 | -45 | -45 | 33 | -50 |
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| Increase (decrease) in trade payables | -105 | -206 | 294 | -868 | 644 | 24 | 47 | -172 | -241 | 346 | 96 |
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| Increase (decrease) in accrued consumption taxes | 47 | -39 | 229 | -93 | 75 | 15 | 65 | 55 | 49 | 113 | -158 |
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| Increase (decrease) in other current liabilities | 254 | -271 | 68 | 96 | -287 | 184 | -92 | 321 | -14 | -419 | 106 |
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| Increase (decrease) in accounts payable - other, and accrued expenses | -96 | -41 | -101 | -8 | -37 | 170 | -139 | -69 | -59 | 81 | -56 |
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| Other, net | -45 | -98 | 65 | -99 | -71 | -49 | 12 | -11 | 14 | -16 | -22 |
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| Subtotal | 1,649 | 506 | 2,080 | 1,068 | 1,078 | 827 | 2,582 | 1,540 | 1,027 | 1,073 | 2,308 |
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| Interest and dividends received | 69 | 69 | 72 | 46 | 33 | 43 | 47 | 53 | 108 | 44 | 48 |
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| Interest paid | -127 | -118 | -111 | -105 | -98 | -85 | -76 | -121 | -127 | -126 | -118 |
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| Income taxes paid | -286 | -251 | -206 | -183 | -341 | -271 | -233 | -326 | -329 | -366 | -321 |
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| Net cash provided by (used in) operating activities | 1,304 | 207 | 1,835 | 826 | 672 | 514 | 2,319 | 1,146 | 678 | 626 | 1,917 |
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| Payments into such as time deposits | - | -14 | -69 | -95 | -586 | -597 | -464 | -401 | -647 | -643 | -639 |
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| Proceeds from withdrawal of time deposits and other | - | - | 27 | 144 | 565 | 612 | 415 | 385 | 660 | 660 | 639 |
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| Purchase of property, plant and equipment | -611 | -812 | -386 | -906 | -698 | -414 | -475 | -381 | -822 | -487 | -673 |
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| Proceeds from sale of property, plant and equipment | 38 | 43 | 128 | 57 | 16 | 5 | 43 | 18 | 14 | 32 | 14 |
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| Purchase of intangible assets | -4 | -37 | -0 | -9 | -6 | -2 | -12 | -10 | -13 | -9 | -5 |
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| Purchase of investment securities | -1 | -1 | -6 | -1 | -1 | -1 | -1 | -1 | -14 | -1 | -1 |
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| Proceeds from sale of investment securities | - | - | 31 | 1 | 14 | - | 31 | - | 293 | - | 60 |
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| Proceeds from refund of guarantee deposits | - | - | - | - | - | - | - | - | - | 100 | - |
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| Decrease (increase) in investments and other assets | -104 | -30 | 7 | 6 | 5 | 8 | 52 | -9 | 28 | 1 | - |
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| Refund of long-term deposits received | -1 | -1 | -4 | -3 | -15 | -1 | -2 | -2 | -6 | -3 | - |
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| Proceeds from long-term deposits received | 21 | 1 | 1 | 37 | 1 | 1 | 0 | 1 | 4 | 4 | 6 |
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| Net cash provided by (used in) investing activities | -641 | -672 | -614 | -791 | -731 | -461 | -312 | -399 | -503 | -346 | -599 |
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| Net increase (decrease) in short-term borrowings | -540 | -257 | -7 | -429 | 53 | 145 | -212 | -132 | -340 | -100 | -565 |
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| Proceeds from long-term borrowings | 2,111 | 2,599 | 1,600 | 1,645 | 1,040 | 1,135 | 3,040 | 1,290 | 1,082 | 758 | 798 |
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| Repayments of long-term borrowings | -1,698 | -2,528 | -1,654 | -1,471 | -1,263 | -1,442 | -3,021 | -1,191 | -428 | -1,041 | -746 |
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| Proceeds from issuance of bonds | - | 35 | 150 | - | 200 | - | 50 | 200 | - | 50 | - |
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| Redemption of bonds | - | - | -158 | -8 | -8 | -158 | -4 | -200 | - | -50 | - |
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| Repayments of finance lease liabilities | -130 | -172 | -208 | -235 | -240 | -268 | -289 | -282 | -284 | -274 | -231 |
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| Purchase of treasury shares | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 |
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| Dividends paid | -20 | -41 | -51 | -41 | -41 | -41 | -41 | -40 | -40 | -25 | -20 |
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| Dividends paid to non-controlling interests | - | - | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 |
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| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | - | - | - | - | - | - | - | -26 | -25 | -26 | -28 |
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| Net cash provided by (used in) financing activities | -279 | -364 | -329 | -540 | -259 | -629 | -476 | -382 | -35 | -707 | -793 |
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| Net increase (decrease) in cash and cash equivalents | 385 | -830 | 892 | -505 | -318 | -576 | 1,531 | 365 | 140 | -427 | 526 |
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