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 | — | 
                                                -150,782,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -152,132,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,526,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | — | 
                                                -266,457,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -427,644,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of securities | — | 
                                                246,598,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                230,971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment | — | 
                                                -492,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -886,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                159,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -75,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -1,351,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,354,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,845,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                5,691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,511,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                308,216,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                302,525,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                312,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |