Notes - Segment Information
| Concept | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-07-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-07-01 to 2023-09-30 | 2023-07-01 to 2023-09-30 | 2023-07-01 to 2023-09-30 | As at 2023-09-30 | 2023-07-01 to 2023-09-30 | As at 2023-03-31 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information | ||||||||||||||||||||||
| Segment information | ||||||||||||||||||||||
| Revenue | ||||||||||||||||||||||
| Revenue from external customers | 
                                                60,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,325,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,183,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,118,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                35,517,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,091,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,517,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intersegment revenue | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revenue | 
                                                60,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,325,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,183,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,118,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                35,517,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,091,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,517,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) before tax | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,146,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,398,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,884,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | — | — | — | — | — | — | — | — | — | 
                                                249,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                237,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — |