Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                -636,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -550,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                116,532,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -109,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                370,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                396,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                344,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                450,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Amortization of goodwill | — | — | 
                                                71,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -4,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -9,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                -3,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                4,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Share of loss (profit) of entities accounted for using equity method | — | — | 
                                                -2,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -175,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                137,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -203,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                34,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                6,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                1,044,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                692,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                5,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -64,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -41,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -160,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -148,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                825,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                506,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -434,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -342,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                145,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loan advances | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from collection of loans receivable | — | — | 
                                                10,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -15,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -556,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -709,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                3,432,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,095,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -2,250,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,337,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of bonds | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                -18,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -117,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -117,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                1,030,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                349,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -1,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                1,298,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                4,694,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,396,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,236,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |