Semi-Annual 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 statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                777,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,070,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,230,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                555,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                293,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -2,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -152,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -117,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                -172,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                5,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -5,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -129,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -96,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                767,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,647,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                153,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -496,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -312,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                429,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,456,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -4,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                76,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -123,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -94,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -522,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -513,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -522,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -513,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                5,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -211,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                959,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                8,801,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,013,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,053,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |