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 | 
|---|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                225,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                229,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                327,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                27,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -8,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                142,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -165,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                587,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -16,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -57,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                114,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -356,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                93,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                660,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -23,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                8,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of securities | — | — | 
                                                -400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment | — | — | 
                                                -8,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -26,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -167,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -500,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -472,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -57,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -73,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                167,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                2,529,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,603,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,435,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |