Consolidated Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | — | 
                                                240,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                96,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                135,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                81,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                96,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                31,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | — | 
                                                7,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                1,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                20,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Share of loss (profit) of entities accounted for using equity method | — | — | 
                                                30,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | — | 
                                                442,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                324,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -20,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -37,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | — | 
                                                4,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -20,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | — | 
                                                -84,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                351,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                37,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | — | 
                                                29,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                -13,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                46,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | — | 
                                                211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                43,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | — | 
                                                -6,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -53,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -19,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                49,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -73,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -42,285,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                3,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||||
| Net increase (decrease) in short-term borrowings | — | — | 
                                                -360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from long-term borrowings | — | — | 
                                                700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | — | 
                                                -568,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -640,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -236,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                351,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                -7,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -4,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                37,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                342,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,015,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                978,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                635,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |