| 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 | 2,875 | 3,701 | 2,154 | 681 | -1,048 | 1,706 | 1,995 | 4,177 | 4,420 | 3,624 | 5,659 | 7,349 |
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| Depreciation | 2,275 | 2,531 | 3,044 | 3,064 | 3,033 | 2,563 | 2,266 | 1,722 | 1,675 | 1,764 | 1,766 | 1,841 |
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| Impairment losses | 650 | 164 | 154 | 1,152 | 1,495 | 364 | 544 | 1,621 | 20 | 3 | 1,725 | 301 |
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| Amortization of long-term prepaid expenses | 299 | 281 | 383 | 322 | 310 | 262 | 143 | 116 | 90 | 157 | 162 | 147 |
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| Increase (decrease) in allowance for doubtful accounts | 34 | 336 | -38 | -17 | 36 | 388 | -132 | -151 | -228 | -13 | - | -22 |
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| Increase (decrease) in provision for bonuses | -140 | 42 | 14 | 20 | 25 | 18 | -6 | 18 | 27 | 10 | 33 | -1 |
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| Increase (decrease) in provision for bonuses for directors (and other officers) | - | - | - | -4 | -3 | -5 | - | 13 | 2 | 1 | - | -2 |
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| Increase (decrease) in provision for loss on contract | - | 352 | - | 739 | 269 | -492 | -78 | -302 | -135 | 110 | -110 | 53 |
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| Increase (decrease) in net defined benefit asset and liability | - | -178 | -271 | -95 | -113 | -137 | 4 | 108 | -262 | -305 | -395 | -422 |
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| Increase (decrease) in other provisions | -8 | 196 | -260 | 89 | 710 | -222 | 223 | -104 | -871 | -7 | -88 | 114 |
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| Interest and dividend income | -43 | -72 | -77 | -48 | -46 | -38 | -32 | -40 | -50 | -49 | -44 | -54 |
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| Interest expenses | 269 | 218 | 198 | 145 | 131 | 73 | 79 | 64 | 68 | 64 | 55 | 60 |
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| Share of loss (profit) of entities accounted for using equity method | -14 | -10 | 9 | -36 | 13 | 13 | -6 | -13 | 1 | -1 | -1 | -1 |
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| Foreign exchange losses (gains) | -23 | -28 | -62 | 18 | 14 | 1 | -9 | 105 | 38 | -25 | 19 | -63 |
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| Loss (gain) on sale and retirement of non-current assets | 16 | 7 | 16 | -73 | 142 | -155 | -44 | -82 | 3 | 60 | -1,094 | -477 |
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| Damage insurance claim gain | - | - | - | - | - | - | - | - | - | - | - | -1,625 |
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| Subsidy income | - | - | - | - | - | - | - | - | - | - | -82 | -32 |
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| Loss on tax purpose reduction entry of non-current assets | - | - | - | - | - | - | - | - | - | - | 46 | - |
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| Oss (gain) on valuation of stock of subsidiaries and affiliates | - | - | - | - | - | - | - | - | - | - | 39 | - |
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| Special reserch cost | 71 | - | - | - | 99 | - | - | - | - | - | 195 | 30 |
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| Compensation expenses | - | - | - | - | - | - | - | - | - | - | - | 92 |
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| Loss (gain) on liquidation of subsidiaries and associates | - | - | - | - | 2 | 66 | - | -168 | - | - | - | -252 |
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| Decrease (increase) in accounts receivable - trade, and contract assets | - | - | - | - | - | - | - | - | - | - | -3,512 | -590 |
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| Decrease (increase) in inventories | 23 | -255 | 586 | -194 | -133 | -1,124 | -462 | 490 | 1,318 | 251 | -106 | -5 |
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| Increase (decrease) in trade payables | -801 | -93 | -50 | -152 | 96 | 671 | -217 | -289 | 291 | -70 | -89 | 75 |
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| Increase/decrease in consumption taxes payable/consumption taxes refund receivable | -46 | -37 | 633 | -339 | -198 | -4 | 85 | 395 | -22 | -139 | 341 | -501 |
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| Increase (decrease) in accrued expenses | -17 | -257 | 73 | -70 | -154 | -18 | 48 | -34 | 74 | -43 | 21 | -53 |
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| Increase (decrease) in deposits received | - | - | - | - | - | -34 | 1,513 | -1,450 | 31 | 310 | 133 | 390 |
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| Increase (decrease) in long-term accounts payable - other | 25 | -7 | -34 | -31 | -0 | -21 | -16 | -7 | - | 267 | -88 | -90 |
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| Other, net | -563 | -473 | -705 | -428 | -500 | -225 | -226 | 1,282 | 277 | -326 | 179 | -54 |
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| Subtotal | 3,358 | 4,165 | 6,743 | 1,914 | 2,566 | 7,878 | 5,634 | 3,317 | 5,642 | 6,761 | 4,766 | 6,203 |
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| Interest and dividends received | 43 | 58 | 99 | 48 | 48 | 38 | 29 | 37 | 51 | 49 | 43 | 52 |
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| Interest paid | -280 | -212 | -194 | -149 | -131 | -72 | -80 | -64 | -68 | -64 | -55 | -60 |
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| Income taxes paid | -2,036 | -1,626 | -2,037 | -548 | -609 | -315 | -500 | -269 | -955 | -430 | -1,358 | -2,249 |
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| Income taxes refund | - | - | - | 193 | 4 | 185 | 27 | 55 | 4 | 4 | 8 | - |
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| Proceeds from damage insurance income | - | - | - | - | - | - | - | - | - | - | - | 1,625 |
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| Subsidies received | - | - | - | - | - | - | - | - | - | - | 198 | 13 |
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| Payments for special reserch cost | -71 | - | - | - | -99 | - | - | - | - | - | -27 | -198 |
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| Net cash provided by (used in) operating activities | 1,013 | 2,385 | 4,611 | 1,457 | 1,778 | 7,599 | 4,957 | 2,903 | 4,674 | 6,321 | 3,576 | 5,386 |
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| Purchase of property, plant and equipment | -1,416 | -2,736 | -1,357 | -1,106 | -993 | -923 | -1,177 | -1,690 | -1,092 | -1,647 | -1,334 | -997 |
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| Proceeds from sale of property, plant and equipment | 28 | 626 | 382 | 1,529 | 30 | 903 | 218 | 911 | 19 | 199 | 2,070 | 782 |
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| Purchase of intangible assets | -1,379 | -1,994 | -1,848 | -1,126 | -988 | -615 | -1,112 | -1,213 | -1,129 | -903 | -1,194 | -1,233 |
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| Purchase of long-term prepaid expenses | -307 | -264 | -87 | -36 | -3 | -19 | -15 | -15 | -13 | -14 | - | - |
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| Loan advances | -46 | -1,350 | -1,308 | -1,215 | -983 | -1,310 | -1,302 | -3 | - | -155 | -1 | -3 |
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| Proceeds from collection of loans receivable | 15 | 864 | 1,484 | 1,339 | 1,068 | 1,311 | 1,503 | 3 | 1 | 155 | - | 2 |
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| Payments of leasehold and guarantee deposits | - | - | - | - | - | - | - | -36 | -794 | -67 | -20 | -106 |
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| Other, net | -48 | -14 | -12 | 41 | 39 | -1 | - | 14 | 13 | 48 | 34 | 27 |
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| Net cash provided by (used in) investing activities | -3,340 | -4,957 | -2,329 | -265 | -1,625 | -804 | -1,803 | 949 | -2,827 | -2,153 | -444 | -1,528 |
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| Net increase (decrease) in short-term borrowings | 1,447 | 2,772 | -1,126 | -798 | 2,729 | -1,187 | -2,453 | -2,800 | 1,100 | - | - | -1,600 |
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| Repayments of long-term borrowings | -189 | -38 | -38 | -26 | -2 | - | -1,269 | -1,600 | - | -800 | -2,800 | -800 |
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| Repayments of finance lease liabilities | -129 | -114 | -62 | -37 | -16 | -2 | -3 | -2 | -2 | -17 | -22 | -21 |
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| Purchase of treasury shares | -5 | -19 | -13 | -11 | -9 | -6 | -5 | -3 | -2 | -3 | -2 | -4 |
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| Proceeds from sale of treasury shares | 0 | 1 | 1 | 0 | - | 0 | - | - | - | - | - | - |
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| Dividends paid | -578 | -578 | -650 | -650 | -650 | -649 | - | - | -360 | -504 | -576 | -1,007 |
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| Dividends paid to non-controlling interests | - | - | -11 | -16 | -13 | -4 | -12 | -4 | -12 | -8 | -14 | -3 |
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| Net cash provided by (used in) financing activities | 547 | 2,026 | -2,612 | -1,538 | 2,040 | -1,850 | -3,744 | -4,427 | 722 | -1,334 | -3,416 | -3,437 |
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| Effect of exchange rate change on cash and cash equivalents | 246 | 525 | 267 | -104 | -104 | 23 | -42 | -111 | -132 | 147 | 234 | 214 |
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| Net increase (decrease) in cash and cash equivalents | -1,534 | -21 | -63 | -512 | 2,089 | 4,967 | -632 | -686 | 2,437 | 2,981 | -50 | 634 |
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