Consolidated Statement Of Changes In Equity
| Concept | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | As at 2019-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net assets | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                701,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,615,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                441,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                701,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,341,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,990,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,159,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,822,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                7,601,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                375,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                441,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -66,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,366,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                8,614,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                221,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -81,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,392,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,044,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                689,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,613,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                303,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,069,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                689,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,848,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,152,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,411,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,197,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -62,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,714,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                545,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,742,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                445,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,689,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                498,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -46,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,912,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                545,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                445,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -62,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,429,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -70,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -64,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                279,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                279,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                279,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                248,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                248,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                248,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disposal of treasury shares | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                13,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                13,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                52,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                243,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                52,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                243,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net changes in items other than shareholders' equity | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                137,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                153,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                153,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                137,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -241,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -276,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -241,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -34,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -276,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -241,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                449,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                297,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                222,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                375,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                153,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                208,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                297,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                311,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -241,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                243,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                203,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                409,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                355,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                355,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                480,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -34,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -276,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -241,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                184,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                243,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                651,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |