Quarterly Statement Of Cash Flows
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                40,012,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                384,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -8,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,739,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                31,866,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -12,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,879,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -336,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -89,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -14,552,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -23,155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -5,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -8,952,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -13,825,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,624,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                3,099,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,602,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                72,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                69,738,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |