| Mar 31,
2013 | Mar 31,
2014 | Mar 31,
2015 | Dec 31,
2015 | Dec 31,
2016 | Dec 31,
2017 | Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Profit (loss) before income taxes | 4,199 | 4,672 | 4,057 | 4,413 | 6,964 | 6,267 | 7,748 | 9,185 | 10,950 | 13,171 | 17,651 | 20,951 |
|---|
| Depreciation | 2,981 | 3,385 | 4,213 | 2,475 | 2,550 | 2,245 | 2,262 | 2,531 | 2,865 | 2,989 | 3,103 | 3,200 |
|---|
| Impairment losses | 31 | 94 | - | - | - | 33 | 23 | - | - | - | - | 102 |
|---|
| Increase (decrease) in allowance for doubtful accounts | - | -2 | -2 | - | - | 1 | - | 191 | 9 | 199 | 27 | - |
|---|
| Increase (decrease) in retirement benefit liability | - | - | - | - | 8 | 5 | 7 | 11 | 19 | -21 | -7 | 15 |
|---|
| Increase (decrease) in provision for loss on orders received | -99 | -128 | -121 | 946 | -924 | 557 | -98 | 51 | -269 | 59 | 420 | -605 |
|---|
| Increase (decrease) in provision for share awards | - | - | - | - | - | - | - | - | - | - | 65 | 101 |
|---|
| Interest and dividend income | -111 | -118 | -110 | -56 | -39 | -37 | -41 | -42 | -40 | -42 | -58 | -55 |
|---|
| Interest expenses | 42 | 37 | 28 | 19 | 17 | 16 | 24 | 32 | 39 | 34 | 22 | 27 |
|---|
| Share of loss (profit) of entities accounted for using equity method | 69 | -91 | -35 | -63 | 37 | - | 59 | 316 | 758 | 392 | 230 | 55 |
|---|
| Loss (gain) on change in equity | - | - | - | - | - | - | - | - | - | - | -31 | - |
|---|
| Loss (gain) on sale of investment securities | - | - | -209 | -1,886 | -7 | -55 | - | -265 | - | - | -73 | -135 |
|---|
| Loss (gain) on valuation of investment securities | - | - | - | - | - | 30 | 610 | 682 | 589 | 53 | 155 | 326 |
|---|
| Loss (gain) on investments in investment partnerships | - | - | - | - | - | - | - | - | - | -86 | -41 | -55 |
|---|
| Decrease (increase) in trade receivables and contract assets | - | - | - | - | - | - | - | - | - | - | -5,729 | -4,932 |
|---|
| Decrease (increase) in inventories | 371 | 36 | -76 | -1,226 | 710 | -258 | -223 | -865 | 597 | 592 | -69 | 73 |
|---|
| Decrease (increase) in advance payments to suppliers | -75 | -489 | -44 | -77 | -906 | -930 | -1,541 | -558 | -2,585 | -2,813 | -3,244 | -2,251 |
|---|
| Increase (decrease) in trade payables | 1,028 | -844 | 76 | -1,788 | 1,407 | 602 | 781 | 834 | 119 | 1,779 | 4,531 | 135 |
|---|
| Increase (decrease) in accrued expenses | 452 | 144 | 135 | -142 | -788 | 31 | 1,461 | 54 | 500 | 1,687 | 510 | -196 |
|---|
| Increase (decrease) in contract liabilities | - | - | - | - | - | - | - | - | - | - | 573 | 1,416 |
|---|
| Increase (decrease) in accrued consumption taxes | 35 | 16 | 683 | -338 | 166 | -149 | 313 | 361 | 541 | 725 | -990 | 474 |
|---|
| Other, net | 65 | -243 | -149 | 1,009 | 408 | 4 | 255 | 632 | 480 | 80 | 565 | 71 |
|---|
| Subtotal | 5,247 | 6,478 | 10,385 | 8,388 | 9,564 | 5,970 | 11,349 | 14,277 | 12,763 | 21,106 | 17,612 | 18,717 |
|---|
| Interest and dividends received | 109 | 141 | 89 | 74 | 41 | 37 | 41 | 37 | 50 | 41 | 60 | 49 |
|---|
| Interest paid | -42 | -37 | -28 | -19 | -17 | -16 | -24 | -32 | -39 | -37 | -22 | -27 |
|---|
| Income taxes paid | -745 | -906 | -1,671 | -2,818 | -1,284 | -1,724 | -2,047 | -3,640 | -2,786 | -4,129 | -5,735 | -5,693 |
|---|
| Net cash provided by (used in) operating activities | 4,761 | 5,705 | 8,776 | 5,624 | 8,303 | 4,265 | 9,319 | 10,642 | 9,987 | 16,981 | 11,914 | 13,046 |
|---|
| Payments into time deposits | -396 | -288 | -500 | -9 | -285 | -279 | -324 | -112 | -79 | -208 | -181 | -126 |
|---|
| Proceeds from withdrawal of time deposits | 409 | 304 | 498 | 18 | 292 | 285 | 282 | 236 | - | 110 | 156 | 81 |
|---|
| Purchase of property, plant and equipment | -176 | -284 | -320 | -111 | -160 | -753 | -651 | -458 | -274 | -291 | -458 | -184 |
|---|
| Purchase of intangible assets | -1,992 | -2,556 | -2,247 | -902 | -1,022 | -1,188 | -1,565 | -1,495 | -1,614 | -2,148 | -2,430 | -2,194 |
|---|
| Payments for asset retirement obligations | - | -8 | - | -8 | -7 | -15 | - | - | -27 | -6 | -53 | -8 |
|---|
| Purchase of investment securities | -713 | -17 | -30 | -89 | -419 | -1,741 | -827 | -258 | -124 | -150 | -489 | -300 |
|---|
| Proceeds from sale of investment securities | 8 | 49 | 34 | 3,571 | 18 | 66 | - | 291 | - | - | 129 | 207 |
|---|
| Purchase of shares of subsidiaries and associates | - | - | - | -5 | - | -110 | -263 | -2,075 | -813 | - | -15 | - |
|---|
| Proceeds from distributions from investment partnerships | - | - | - | - | - | - | - | 189 | 316 | 198 | 79 | 142 |
|---|
| Payments of leasehold and guarantee deposits | -16 | -40 | -30 | -30 | -62 | -158 | -70 | -92 | -194 | -33 | -11 | -16 |
|---|
| Proceeds from refund of leasehold and guarantee deposits | 12 | 28 | 23 | 23 | 15 | 41 | 68 | 8 | 19 | 83 | 149 | 24 |
|---|
| Proceeds from purchase of shares of subsidiaries resulting in change in scope of consolidation | - | - | - | - | - | - | - | - | - | - | - | 25 |
|---|
| Other, net | -15 | -9 | -10 | -2 | -2 | -3 | -3 | -5 | 5 | 6 | -7 | -12 |
|---|
| Net cash provided by (used in) investing activities | -2,883 | -2,824 | -2,583 | 2,642 | -34 | -1,855 | -3,353 | -3,952 | -3,230 | -2,815 | -3,132 | -2,359 |
|---|
| Repayments of lease liabilities | -1,013 | -1,035 | -938 | -696 | -715 | -593 | -760 | -967 | -1,168 | -1,166 | -929 | -875 |
|---|
| Dividends paid | -651 | -651 | -781 | -912 | -1,270 | -1,759 | -1,792 | -2,280 | -2,769 | -3,290 | -4,105 | -5,799 |
|---|
| Purchase of treasury shares | - | - | - | - | - | - | - | - | - | - | -384 | -1 |
|---|
| Proceeds from sale of treasury shares | - | - | - | - | - | - | - | - | - | - | - | 7 |
|---|
| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | - | - | - | - | - | - | - | - | - | - | - | -33 |
|---|
| Net cash provided by (used in) financing activities | -1,674 | -1,696 | -1,729 | -1,619 | -1,991 | -2,363 | -2,564 | -3,260 | -3,942 | -4,461 | -5,419 | -6,702 |
|---|
| Effect of exchange rate change on cash and cash equivalents | 282 | 205 | 400 | -132 | -258 | 57 | -134 | -68 | -21 | 242 | 194 | 225 |
|---|
| Net increase (decrease) in cash and cash equivalents | 485 | 1,390 | 4,864 | 6,515 | 6,018 | 105 | 3,266 | 3,360 | 2,792 | 9,947 | 3,556 | 4,210 |
|---|