| Sep 30,
2015 | Sep 30,
2016 | Sep 30,
2017 | Sep 30,
2018 | Sep 30,
2019 | Sep 30,
2020 | Sep 30,
2021 | Sep 30,
2022 | Sep 30,
2023 |
|---|
| Profit (loss) before income taxes | 349 | 430 | 245 | 257 | 280 | 289 | 331 | 370 | 399 |
|---|
| Depreciation | 16 | 14 | 17 | 21 | 47 | 32 | 35 | 41 | 55 |
|---|
| Increase (decrease) in allowance for doubtful accounts | -3 | 0 | 1 | -1 | -0 | 0 | 0 | 0 | 1 |
|---|
| Increase (decrease) in provision for bonuses | -3 | 1 | -2 | 3 | -2 | 5 | 3 | 3 | 3 |
|---|
| Increase (decrease) in provision for warranties for completed construction | 2 | 1 | 2 | -2 | -1 | -1 | 0 | 3 | 2 |
|---|
| Increase (decrease) in provision for retirement benefits for directors (and other officers) | -2 | 6 | 5 | 15 | 1 | 10 | 12 | 10 | 16 |
|---|
| Increase (decrease) in retirement benefit liability | -5 | -2 | 3 | 2 | 0 | -1 | -2 | 1 | 6 |
|---|
| Interest and dividend income | -2 | -2 | -3 | -3 | -3 | -4 | -4 | -5 | -5 |
|---|
| Gain on maturity of insurance contract | -2 | -13 | -36 | - | -11 | -3 | -25 | -4 | - |
|---|
| Interest expenses | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
|---|
| Loss (gain) on valuation of investment securities | - | - | - | - | 36 | - | 2 | 13 | - |
|---|
| Going public expenses | - | - | 9 | - | - | - | - | 16 | - |
|---|
| Decrease (increase) in trade receivables | -101 | -7 | -107 | -11 | -17 | -76 | 51 | -63 | -179 |
|---|
| Decrease (increase) in real estate for sale | 314 | 109 | 71 | 45 | - | -123 | -32 | 30 | 47 |
|---|
| Decrease (increase) in costs on construction contracts in progress | 53 | 5 | 7 | -0 | -5 | -6 | 7 | 15 | 0 |
|---|
| Increase (decrease) in trade payables | 50 | -132 | -10 | 13 | 21 | 44 | -5 | 19 | 1 |
|---|
| Increase (decrease) in advances received on construction contracts in progress | -1 | 25 | -37 | -10 | 31 | 10 | 5 | -20 | -25 |
|---|
| Other, net | 66 | -74 | 32 | 1 | 0 | 7 | 5 | 3 | 25 |
|---|
| Subtotal | 733 | 299 | 207 | 332 | 388 | 188 | 400 | 433 | 346 |
|---|
| Interest and dividends received | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 5 | 5 |
|---|
| Interest paid | -2 | -2 | -2 | -2 | -1 | -1 | -1 | -1 | -1 |
|---|
| Income taxes paid | -142 | -119 | -148 | -64 | -87 | -112 | -83 | -128 | -145 |
|---|
| Net cash provided by (used in) operating activities | 591 | 183 | 161 | 269 | 303 | 78 | 320 | 310 | 205 |
|---|
| Payments into time deposits | -68 | -162 | -12 | -11 | -13 | -63 | -13 | -13 | -13 |
|---|
| Proceeds from withdrawal of time deposits | 47 | 120 | 10 | 110 | 13 | 13 | 13 | 13 | 13 |
|---|
| Purchase of property, plant and equipment | -18 | -5 | -18 | -26 | -363 | -72 | -29 | -502 | -22 |
|---|
| Proceeds from sale of property, plant and equipment | 0 | - | - | - | - | - | - | 1 | 13 |
|---|
| Purchase of intangible assets | -2 | - | - | -2 | -6 | -2 | -3 | -3 | -1 |
|---|
| Purchase of investment securities | -3 | -3 | -81 | -3 | - | -1 | -31 | -1 | -1 |
|---|
| Proceeds from redemption of investment securities | - | - | - | - | - | - | - | 30 | - |
|---|
| Proceeds from sale of investment property | - | - | - | - | - | - | - | 50 | - |
|---|
| Purchase of insurance funds | -4 | -2 | -12 | -16 | -25 | -26 | -24 | -24 | -23 |
|---|
| Proceeds from cancellation of insurance funds | 5 | 25 | 80 | - | 28 | 7 | 67 | 11 | 6 |
|---|
| Other, net | -3 | -1 | -59 | 1 | 2 | -0 | 1 | -2 | -1 |
|---|
| Net cash provided by (used in) investing activities | -46 | -28 | -93 | 53 | -365 | -146 | -18 | -441 | -29 |
|---|
| Proceeds from long-term borrowings | 60 | 200 | - | - | 40 | 50 | - | 10 | - |
|---|
| Repayments of long-term borrowings | -81 | -209 | -40 | -40 | -45 | -47 | -40 | -22 | -23 |
|---|
| PaymentOfGoingPublicExpensesFinCF | - | - | - | - | - | - | - | -8 | -8 |
|---|
| Dividends paid | -15 | -30 | -30 | -73 | -51 | -51 | -56 | -64 | -80 |
|---|
| Other, net | - | - | -1 | -1 | -1 | -1 | -1 | -0 | 1 |
|---|
| Net cash provided by (used in) financing activities | -36 | -40 | 379 | -114 | -57 | 160 | -97 | -84 | -110 |
|---|
| Net increase (decrease) in cash and cash equivalents | 510 | 116 | 447 | 208 | -119 | 92 | 204 | -216 | 65 |
|---|