| 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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| (loss) before income taxes | - | - | - | - | - | - | - | - | -3,472 | -2,037 | -328 |
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| Depreciation | 4,930 | 5,249 | 5,316 | 5,458 | 5,545 | 5,524 | 5,329 | 5,483 | 5,688 | 5,782 | 5,803 |
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| Amortization of bond issuance costs | - | - | - | 4 | 5 | 9 | 14 | 18 | 23 | 28 | 33 |
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| Increase (decrease) in provision for retirement benefits | 4 | 2 | 4 | -6 | 1 | 6 | 7 | 4 | 5 | 0 | 8 |
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| Increase (decrease) in provision for bonuses | 12 | 5 | -0 | -3 | 0 | 4 | 4 | 5 | -1 | -6 | 3 |
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| Increase(decrease) in provision for vehicle repairs | 82 | 81 | 69 | -202 | 69 | 81 | 72 | -256 | 64 | 64 | 22 |
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| Interest and dividend income | -2 | -1 | -1 | -1 | -0 | -0 | -0 | -0 | -0 | -0 | -0 |
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| Interest expenses on borrowings and bonds | - | - | 1,713 | 1,687 | 1,523 | 1,323 | 1,194 | 1,106 | 1,045 | 932 | 840 |
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| Loss (gain) on sale and retirement of non-current assets | 7 | - | - | - | - | - | 2 | - | 0 | -2 | 8 |
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| Evaluation on railway facilities as received propertyeirwy | - | - | - | - | - | - | - | -278 | - | -28 | - |
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| Subsidy income | -98 | -13 | -167 | -259 | -243 | -219 | -201 | -478 | -322 | -266 | -260 |
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| Contribution received for construction | - | - | - | - | - | - | - | - | - | - | -530 |
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| Office work fee | - | - | - | - | - | - | - | -2 | -1 | -2 | -3 |
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| Fiduciary obligation fee | - | - | - | - | - | - | - | -4 | -7 | -5 | - |
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| Insurance claim income | - | - | - | -112 | - | - | - | -6 | - | - | -3 |
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| Loss on tax purpose reduction entry of non-current assets | 90 | 13 | 167 | 361 | 231 | 215 | 192 | 441 | 285 | 177 | 747 |
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| Commission expenses | 16 | 23 | 27 | 23 | 24 | 23 | 19 | 17 | 51 | 44 | 34 |
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| Increase (decrease) in accrued consumption taxes | 153 | -117 | 216 | -128 | -2 | -52 | 21 | -102 | - | 203 | 29 |
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| Increase (decrease) in income taxes payable - factor based tax | 5 | 2 | -7 | 16 | 67 | -2 | 21 | 2 | -53 | 25 | 18 |
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| Increase(decrease) in uneamed fares | 39 | 201 | -115 | -15 | 2 | 49 | 50 | 41 | -108 | -15 | 27 |
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| Decrease(increase) In accrued faresOpeCF | -46 | -180 | 137 | 3 | 23 | -21 | -76 | 139 | -0 | -56 | -118 |
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| Decrease (increase) in accounts receivable - other | 6 | 109 | -7 | 7 | -6 | 16 | -9 | -39 | 33 | -82 | 104 |
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| Decrease (increase) in consumption taxes refund receivable | - | - | - | - | - | - | - | -100 | -45 | 145 | - |
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| Decrease (increase) in other assets | - | - | - | - | - | - | - | - | 86 | -23 | 12 |
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| Increase(decrease) in inter-line fares received | 5 | -1 | -8 | -1 | -1 | -2 | -1 | -6 | -0 | 1 | 3 |
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| Increase (decrease) in other liabilities | - | - | - | - | - | - | - | - | -276 | 153 | -306 |
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| Subtotal | 6,516 | 6,882 | 6,747 | 6,835 | 7,576 | 7,546 | 7,636 | 7,164 | 2,996 | 5,031 | 6,145 |
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| Interest received | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Interest paid | -1,884 | -1,910 | -1,704 | -1,680 | -1,521 | -1,290 | -1,199 | -1,124 | -1,043 | -934 | -835 |
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| Income taxes paid | -1 | -4 | -71 | -2 | -4 | -82 | -125 | -211 | -163 | -2 | -4 |
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| Income taxes refund | - | - | - | 17 | 0 | - | - | - | - | 114 | 0 |
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| Subsidy income for operating expenses | 37 | - | - | - | 20 | 4 | 8 | 122 | - | 140 | -52 |
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| Office work fee received | - | - | - | - | - | - | - | 2 | 2 | 1 | 4 |
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| Proceeds from fiduciary obligation fee | - | - | - | - | - | - | - | 4 | 7 | 10 | - |
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| Proceeds from insurance income | - | - | - | 112 | - | - | - | 6 | - | - | 3 |
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| Net cash provided by (used in) operating activities | 5,307 | 4,915 | 4,973 | 5,273 | 6,071 | 6,178 | 6,321 | 5,963 | 1,766 | 4,361 | 5,260 |
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| Proceeds from subsidy for construction | 90 | 31 | 112 | 322 | 232 | 213 | 191 | 445 | 285 | 177 | 247 |
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| Proceeds from contribution received for construction | - | - | - | - | - | - | - | - | - | - | 197 |
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| Proceeds from sale of property, plant and equipment | - | - | 35 | 1 | - | - | - | 26 | - | - | 20 |
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| Purchase of property, plant and equipment | -1,845 | -2,808 | -2,693 | -775 | -482 | -552 | -1,665 | -2,293 | -2,907 | -2,938 | -3,256 |
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| Purchase of intangible assets | -553 | -695 | -242 | -8 | -131 | -525 | -392 | -169 | -599 | -124 | -414 |
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| Proceeds from withdrawal of time deposits | - | 12 | 22 | 30 | 62 | 61 | 141 | 321 | 61 | 94 | - |
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| Proceeds from redemption of securities | 750 | 1,250 | 520 | 400 | 1,500 | 1,000 | 3,000 | 3,600 | 300 | 300 | - |
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| Proceeds from long-term deposits received | - | - | 41 | - | - | 176 | - | 18 | - | - | 7 |
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| Refund of long-term deposits received | -160 | -157 | -184 | -157 | -157 | -154 | -151 | -173 | -140 | -134 | -116 |
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| Net cash provided by (used in) investing activities | -2,460 | -3,829 | -3,071 | -1,298 | -567 | -2,891 | -2,528 | 1,413 | -3,693 | -2,625 | -3,316 |
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| Proceeds from long-term borrowings | 11,080 | 11,370 | 11,520 | 10,737 | 9,675 | 9,129 | 8,128 | 5,776 | 13,826 | 7,186 | 6,534 |
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| Repayments of long-term borrowings | -7,234 | -9,297 | -9,072 | -9,937 | -11,196 | -10,298 | -11,338 | -11,260 | -11,509 | -11,892 | -11,615 |
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| Repayments of long-term accounts payable - other | -5,192 | -5,295 | -5,412 | -5,501 | -5,597 | -10,889 | -8,390 | -6,040 | -4,962 | -5,019 | -5,044 |
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| Proceeds from issuance of bonds | - | - | - | 4,958 | 5,955 | 5,959 | 5,961 | 5,961 | 7,952 | 7,952 | 7,952 |
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| Repayments of finance lease liabilities | -11 | -10 | -8 | -12 | -46 | -114 | -119 | -119 | -119 | -119 | -124 |
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| Net cash provided by (used in) financing activities | -1,356 | -3,232 | -2,972 | 244 | -1,208 | -6,212 | -5,758 | -5,680 | 5,188 | -1,892 | -2,296 |
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| Net increase (decrease) in cash and cash equivalents | 1,491 | -2,146 | -1,069 | 4,219 | 4,296 | -2,925 | -1,965 | 1,695 | 3,261 | -156 | -352 |
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