Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                1,359,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,240,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                26,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -1,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -114,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -157,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                1,274,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,129,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | 
                                                -6,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of property, plant and equipment | 
                                                -789,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -483,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                3,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | 
                                                -110,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | 
                                                734,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | 
                                                -13,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -193,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -496,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -72,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -115,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -117,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -135,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -200,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                38,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                984,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                443,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                5,634,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,650,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,207,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |