| 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 | 14,467 | 16,210 | 19,619 | 21,804 | 31,731 | 25,562 | 36,395 |
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| Depreciation | 6,314 | 7,323 | 8,083 | 8,901 | 8,701 | 8,591 | 8,663 |
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| Amortization of goodwill | 176 | 176 | 176 | 176 | 176 | 176 | 176 |
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| Share of loss (profit) of entities accounted for using equity method | -398 | -581 | -915 | -654 | -495 | -774 | -1,229 |
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| Loss (gain) on sale of property, plant and equipment | -40 | -1,292 | -262 | -604 | -592 | -1 | -490 |
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| Loss on retirement of property, plant and equipment | 1,175 | 694 | 141 | 49 | 311 | 571 | 455 |
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| Impairment losses | 1,013 | - | - | 127 | 2,379 | 3,263 | 1,025 |
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| Loss (gain) on sale of investment securities | -116 | - | -1,852 | -680 | -9,939 | - | 287 |
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| Loss (gain) on valuation of investment securities | - | - | - | 696 | - | 179 | 19 |
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| Increase (decrease) in allowance for doubtful accounts | -13 | - | 23 | -1 | 2 | -24 | -8 |
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| Increase (decrease) in provision for bonuses | 61 | 86 | 79 | 137 | 176 | 9 | 260 |
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| Increase (decrease) in retirement benefit liability | 298 | 70 | 207 | 208 | 204 | 171 | 274 |
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| Retirement benefit expenses | -8 | -22 | -45 | -35 | -32 | -56 | -61 |
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| Increase (decrease) in provision for retirement benefits for directors (and other officers) | 17 | -3 | 17 | -248 | -22 | 6 | 7 |
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| Interest and dividend income | -499 | -534 | -581 | -564 | -673 | -566 | -641 |
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| Interest expenses | 4,481 | 4,984 | 5,185 | 5,528 | 6,052 | 5,662 | 4,513 |
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| Decrease (increase) in trade receivables | 8,799 | 2,073 | -4,397 | -2,389 | -12,864 | 9,308 | -3,512 |
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| Decrease (increase) in inventories | -10,316 | -26,084 | -31,378 | -22,469 | -40,280 | -17,528 | 16,162 |
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| Decrease (increase) in leasehold and guarantee deposits | 229 | -45 | -2,668 | -3,894 | -375 | -730 | -793 |
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| Increase (decrease) in leasehold and guarantee deposits received | -917 | 9,161 | 5,892 | 3,999 | 1,015 | 246 | 2,981 |
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| Decreace (increase) in operating investement in capital | 1,930 | -1,342 | 1,714 | -259 | -46 | -22 | -266 |
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| Increase (decrease) in trade payables | 3,007 | 5,583 | -4,867 | -72 | 28 | 4,558 | -145 |
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| Increase/decrease in consumption taxes payable/consumption taxes refund receivable | -455 | -2,139 | 926 | 1,493 | 989 | -25 | -1,200 |
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| Other, net | -1,648 | -4,915 | 2,065 | 2,151 | 1,412 | 5,116 | 3,860 |
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| Subtotal | 29,228 | 10,810 | 1,036 | 17,552 | -6,552 | 44,360 | 67,088 |
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| Interest and dividends received | 599 | 631 | 697 | 690 | 778 | 888 | 784 |
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| Interest paid | -4,502 | -4,988 | -5,185 | -5,528 | -6,036 | -5,655 | -4,389 |
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| Income taxes paid | -2,296 | -848 | -1,789 | -4,497 | -3,989 | -17,541 | -5,948 |
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| Net cash provided by (used in) operating activities | 23,028 | 5,604 | -5,241 | 8,217 | -15,800 | 22,051 | 57,534 |
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| Purchase of property, plant and equipment | -47,435 | -36,580 | -30,751 | -36,534 | -35,569 | -41,488 | -87,941 |
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| Proceeds from sale of property, plant and equipment | 1,265 | 3,260 | 442 | 9,315 | 2,226 | 233 | 1,032 |
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| Payments for asset retirement obligations | - | - | -79 | -6 | - | - | -9 |
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| Purchase of intangible assets | -327 | -90 | -150 | -1,031 | -2,407 | -95 | -6,458 |
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| Purchase of investment securities and others | - | -4,930 | -1,749 | -199 | -5,472 | -4,218 | -18,520 |
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| Proceeds from sales of investment securities and others | 1,338 | - | 2,886 | 938 | 10,900 | - | - |
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| Proceeds from divestments | - | - | - | - | - | 7,730 | 993 |
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| Payment of long-term prepaid expenses | -329 | -1,100 | -1,786 | -1,164 | -2,388 | -912 | -16,605 |
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| Other, net | -338 | -574 | 134 | 375 | 7 | 49 | -476 |
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| Net cash provided by (used in) investing activities | -45,827 | -40,015 | -30,933 | -28,307 | -32,704 | -38,701 | -127,985 |
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| Net increase (decrease) in short-term borrowings | -4,000 | -3,000 | -1,000 | -400 | - | - | 13,000 |
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| Proceeds from long-term borrowings | 113,550 | 132,935 | 125,641 | 125,100 | 131,000 | 67,000 | 171,535 |
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| Repayments of long-term borrowings | -88,065 | -72,526 | -95,037 | -79,784 | -52,515 | -82,245 | -116,247 |
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| Proceeds from issuance of bonds | - | - | 7,443 | 9,946 | 9,942 | 19,893 | - |
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| Redemption of bonds | - | - | -800 | -300 | -300 | -300 | -300 |
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| Repayments of lease liabilities | -22 | -24 | -39 | -37 | -50 | -28 | -88 |
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| Dividends paid | -2,020 | -2,087 | -2,087 | -2,434 | -2,434 | -2,608 | -2,608 |
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| Dividends paid to non-controlling interests | -119 | -110 | -114 | -116 | -110 | -132 | -195 |
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| Proceeds from sale of shares of subsidiaries not resulting in change in scope of consolidation | - | - | - | - | - | - | 5,230 |
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| Net cash provided by (used in) financing activities | 14,755 | 55,186 | 34,050 | 50,884 | 85,530 | 1,578 | 70,324 |
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| Effect of exchange rate change on cash and cash equivalents | - | - | -12 | -28 | -71 | 143 | -284 |
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| Net increase (decrease) in cash and cash equivalents | -8,042 | 20,774 | -2,136 | 30,766 | 36,954 | -14,928 | -410 |
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