Quarterly 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 | 
|---|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                -1,146,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -675,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -650,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                139,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                228,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Amortization of goodwill | — | — | 
                                                102,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -5,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -1,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                36,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | — | 
                                                -1,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                211,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -259,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                12,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                49,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -132,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                75,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -127,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                92,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -426,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                1,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -36,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -47,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -62,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -153,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                94,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -392,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -175,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -265,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                1,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                -80,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -38,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -33,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -287,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -280,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                210,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -465,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -620,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of bonds | — | — | 
                                                -14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -78,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -49,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -83,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | — | — | 
                                                -8,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                265,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -342,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                4,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                75,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -993,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                2,541,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,466,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,459,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |