Quarterly 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 statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                9,668,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,982,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,927,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                2,782,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,368,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -71,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -357,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -51,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -113,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                628,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -197,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                493,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                423,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                9,771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                337,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                195,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -2,058,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,026,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                8,062,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,430,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -39,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -75,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -1,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -3,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,143,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -3,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                4,358,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,206,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                23,584,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                19,178,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,384,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |