Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2023-12-31 | 2023-07-01 to 2023-12-31 | As at 2023-06-30 | 2022-07-01 to 2022-12-31 | As at 2022-12-31 | As at 2022-06-30 | 
|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                -2,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -121,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | — | 
                                                115,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                121,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | — | 
                                                13,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                2,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | — | 
                                                -1,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | — | 
                                                6,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in retirement benefit liability | — | 
                                                -3,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | — | 
                                                3,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share of loss (profit) of entities accounted for using equity method | — | 
                                                260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | — | 
                                                -369,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -55,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                -574,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -501,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                179,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -36,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -34,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -49,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                -631,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -584,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                1,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -5,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -5,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -671,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -596,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -28,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -96,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                3,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -1,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -6,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -32,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -121,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | — | 
                                                -65,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -74,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Redemption of bonds | — | 
                                                -18,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -18,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -23,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -23,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                702,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                676,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -2,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -4,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -41,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                647,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                651,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                501,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                542,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |