Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2022-12-21 to 2023-12-20 | 2022-12-21 to 2023-12-20 | As at 2023-12-20 | As at 2022-12-20 | 2021-12-21 to 2022-12-20 | 2021-12-21 to 2022-12-20 | As at 2021-12-20 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                -131,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -122,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                42,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                117,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                105,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Impairment losses | — | 
                                                14,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                -361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | — | 
                                                -8,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -9,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | — | 
                                                9,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in retirement benefit liability | — | 
                                                18,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | — | 
                                                40,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                243,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                -88,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -58,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                -13,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -9,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -3,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -62,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                -45,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                246,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                8,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -9,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -9,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -8,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -59,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -27,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                233,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | 
                                                -136,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -56,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -2,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -64,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -76,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | 
                                                280,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -324,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -368,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -17,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -17,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -29,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -141,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -145,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                5,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -228,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | — | 
                                                485,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                713,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                691,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |