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 | 
                                                460,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                594,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                377,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                239,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                94,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -3,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                8,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                11,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                1,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | — | 
                                                -294,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                153,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -148,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -79,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                54,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -46,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -69,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                476,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                3,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -8,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -165,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                305,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                359,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -314,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -569,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                500,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -4,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                175,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -577,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -447,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -135,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -64,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -60,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -513,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                403,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -32,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                1,517,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,550,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,364,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |