Key Financial Data Of Group
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2021-01-01 to 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 2021-01-01 to 2021-12-31 | 2020-01-01 to 2020-12-31 | As at 2020-12-31 | 2020-01-01 to 2020-12-31 | As at 2020-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||||
| Net sales | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,861,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,219,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                782,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,071,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,106,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,294,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,731,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,449,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,118,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Operating revenue | — | — | — | 
                                                729,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                975,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | — | 
                                                -326,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -211,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                357,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                338,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -45,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -210,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                445,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                160,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | 
                                                -413,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -204,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -265,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                202,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income | — | — | — | — | 
                                                -325,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                286,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -267,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                202,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                244,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net assets | — | — | 
                                                939,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                765,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,745,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,468,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                879,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                960,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,238,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,134,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,159,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                931,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | 
                                                3,763,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,751,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,995,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,795,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,884,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,527,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,423,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,004,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,585,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,478,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | 
                                                90.37
                                                
                                             | — | — | — | 
                                                53.06
                                                
                                             | — | — | 
                                                94.14
                                                
                                             | — | 
                                                143.55
                                                
                                             | 
                                                87.99
                                                
                                             | — | 
                                                97.20
                                                
                                             | — | — | 
                                                125.42
                                                
                                             | 
                                                114.84
                                                
                                             | — | — | 
                                                117.37
                                                
                                             | — | 
                                                94.34
                                                
                                             | 
| Basic earnings (loss) per share | — | — | — | 
                                                -53.19
                                                
                                             | 
                                                -41.05
                                                
                                             | — | — | — | 
                                                -20.43
                                                
                                             | — | 
                                                24.02
                                                
                                             | — | — | 
                                                -26.85
                                                
                                             | — | 
                                                -28.22
                                                
                                             | 
                                                8.03
                                                
                                             | — | — | 
                                                20.49
                                                
                                             | 
                                                22.30
                                                
                                             | — | 
                                                14.74
                                                
                                             | — | 
| Diluted earnings per share | — | — | — |  |  | — | — | — |  | — | 
                                                23.05
                                                
                                             | — | — |  | — |  | 
                                                7.96
                                                
                                             | — | — | 
                                                20.29
                                                
                                             | 
                                                22.28
                                                
                                             | — | 
                                                14.73
                                                
                                             | — | 
| Equity-to-asset ratio | — | — | 
                                                0.242
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.142
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.190
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.381
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.224
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.272
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.362
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.283
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.731
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.630
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.200
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.066
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.196
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.271
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.178
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                30.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                60.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                23.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                41.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                71.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | — | — | 
                                                129,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -45,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                257,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                305,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                284,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | — | — | 
                                                71,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                193,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -307,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -1,846,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -64,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | — | — | 
                                                -868,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                355,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                36,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,744,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                89,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | 
                                                771,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,436,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                898,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                906,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                693,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Number of employees | 
                                                57
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                22
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                27
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                27
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                32
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                128
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                23
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                78
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                72
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                72
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                77
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                50
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                57
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                10
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |