Consolidated 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 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                -872,776,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                779,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -897,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                783,335,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | — | 
                                                -601,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -417,446,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of securities | — | 
                                                253,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                228,069,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment | — | 
                                                -4,044,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,573,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                311,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -202,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -119,386,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -5,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,294,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -13,047,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,772,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid to non-controlling interests | — | 
                                                -52,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -17,718,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                56,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,117,659,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                648,085,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,685,379,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,803,038,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,154,953,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |