Key Financial Data Of Group
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | As at 2022-09-30 | 2021-10-01 to 2022-09-30 | As at 2021-09-30 | 2020-10-01 to 2021-09-30 | As at 2021-09-30 | 2020-10-01 to 2021-09-30 | 2019-10-01 to 2020-09-30 | As at 2020-09-30 | As at 2020-09-30 | 2019-10-01 to 2020-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||||||||||
| Net sales | — | 
                                                4,856,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                9,301,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4,214,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,577,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,515,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,220,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,438,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,985,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,908,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,122,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                302,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                806,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                290,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                685,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                490,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                856,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                504,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                801,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                325,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                419,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | — | — | — | — | — | 
                                                622,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                874,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                408,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                571,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                226,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | — | — | — | — | — | 
                                                627,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                914,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                411,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                587,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                233,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,476,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,189,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                3,654,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,538,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,349,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,795,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,823,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,115,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,464,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,529,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                9,252,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,572,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                5,150,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,382,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,581,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,487,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,709,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,020,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,483,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,081,066,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | 
                                                1,864.04
                                                
                                             | — | 
                                                1,446.96
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,354.25
                                                
                                             | — | 
                                                1,652.17
                                                
                                             | — | — | 
                                                1,242.81
                                                
                                             | 
                                                1,386.92
                                                
                                             | — | 
                                                911.73
                                                
                                             | — | 
                                                1,031.90
                                                
                                             | — | — | 
                                                732.09
                                                
                                             | 
                                                745.04
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                78.18
                                                
                                             | — | — | — | — | — | 
                                                222.29
                                                
                                             | — | — | — | — | — | — | — | 
                                                170.45
                                                
                                             | — | 
                                                324.40
                                                
                                             | 
                                                97.52
                                                
                                             | — | — | 
                                                153.17
                                                
                                             | — | 
                                                178.74
                                                
                                             | — | 
                                                285.95
                                                
                                             | 
                                                95.77
                                                
                                             | — | — | 
                                                113.16
                                                
                                             | 
| Diluted earnings per share | — | 
                                                76.50
                                                
                                             | — | — | — | — | — | 
                                                217.50
                                                
                                             | — | — | — | — | — | — | — | 
                                                167.91
                                                
                                             | — | 
                                                319.56
                                                
                                             | 
                                                95.77
                                                
                                             | — | — | 
                                                150.42
                                                
                                             | — |  | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.583
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.553
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                0.709
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.731
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.576
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.492
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.343
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.420
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.245
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | — | 
                                                0.056
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                0.126
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                0.131
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.213
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.100
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.141
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.217
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.322
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.140
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.164
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | — | 
                                                54.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                19.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                10.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                17.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                11.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | — | — | — | — | — | — | 
                                                509,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                766,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                884,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,475,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                549,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | — | — | — | — | — | 
                                                -1,663,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                418,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -743,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -170,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -800,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | — | — | — | — | — | 
                                                101,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -425,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                263,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -1,165,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                94,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                802,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,854,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,095,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                691,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                552,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of employees | 
                                                276
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                149
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                26
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                17
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                96
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                16
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                64
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                17
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                21
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                151
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                274
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                143
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                213
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                190
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                128
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                179
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | 
                                                231
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                56
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                127
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                89
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                40
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                53
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                235
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                46
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                208
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                269
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                75
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                198
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |