Consolidated Statement Of Financial Position
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of financial position | ||||||||||||||||||||||||||||
| Statement of financial position | ||||||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||||||
| Current assets | ||||||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | 
                                                3,700,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,495,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                3,201,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,596,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Trade and other receivables | — | — | — | — | — | 
                                                525,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                672,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other current assets | — | — | — | — | — | 
                                                82,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                72,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current assets | — | — | — | — | — | 
                                                4,308,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,240,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets | ||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | 
                                                27,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                28,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Goodwill | — | — | — | — | — | 
                                                1,709,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,615,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other financial assets | — | — | — | — | — | 
                                                1,493,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,458,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets | — | — | — | — | — | 
                                                4,412,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,250,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Assets | — | — | — | — | — | 
                                                8,721,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,490,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities and equity | ||||||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||||||
| Current liabilities | ||||||||||||||||||||||||||||
| Trade and other payables | — | — | — | — | — | 
                                                566,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                574,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Income taxes payable | — | — | — | — | — | 
                                                50,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                40,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other current liabilities | — | — | — | — | — | 
                                                187,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                191,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current liabilities | — | — | — | — | — | 
                                                1,002,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,019,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current liabilities | ||||||||||||||||||||||||||||
| Deferred tax liabilities | — | — | — | — | — | 
                                                373,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                344,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other non-current liabilities | — | — | — | — | — | 
                                                11,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                18,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current liabilities | — | — | — | — | — | 
                                                1,306,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,333,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | — | — | — | — | — | 
                                                2,308,718,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,353,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | ||||||||||||||||||||||||||||
| Equity attributable to owners of parent | ||||||||||||||||||||||||||||
| Share capital | — | — | — | — | — | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Capital surplus | — | — | — | — | — | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Retained earnings | — | — | — | — | — | 
                                                912,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                804,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Treasury shares | — | — | — | — | — | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other components of equity | — | — | — | — | — | 
                                                238,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                70,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity attributable to owners of parent | — | — | — | — | — | 
                                                6,412,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,137,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                238,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,412,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,412,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                912,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,137,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                804,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,137,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                629,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,429,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,954,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,949,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,949,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,947,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,427,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,947,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,952,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                577,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and equity | — | — | — | — | — | 
                                                8,721,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,490,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |