Key Financial Data Of Reporting Company
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2024-09-30 | 2023-10-01 to 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 reporting company | ||||||||||||||||||||
| Business results of reporting company | ||||||||||||||||||||
| Net sales | — | 
                                                13,747,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,709,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,141,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                17,792,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,004,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,338,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,351,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,184,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,013,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,247,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                277,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                399,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                528,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                603,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                366,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                446,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                482,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                147,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                340,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                229,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -12,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                39,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Share capital | — | — | 
                                                157,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                157,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                157,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                157,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                157,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total number of issued shares | — | — | 
                                                8,624,320
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                8,624,320
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                8,624,320
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                8,624,320
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                8,624,320
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
| Net assets | 
                                                2,004,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,093,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,957,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,034,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,620,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,644,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,365,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,392,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,362,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,278,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                4,407,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,110,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,596,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,106,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,573,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,925,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,241,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,831,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,386,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,503,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | 
                                                231.60
                                                
                                             | — | 
                                                241.99
                                                
                                             | — | 
                                                224.69
                                                
                                             | — | 
                                                220.90
                                                
                                             | — | — | 
                                                184.67
                                                
                                             | 
                                                176.37
                                                
                                             | — | 
                                                157.69
                                                
                                             | — | 
                                                153.37
                                                
                                             | — | — | 
                                                159.15
                                                
                                             | 
                                                145.27
                                                
                                             | — | 
| Dividend paid per share | — | 
                                                6.25
                                                
                                             | — | — | — |  | — | — |  | — | — | — | — |  | — | — |  | — | — | — | 
| Interim dividend paid per share | — |  | — | — | — |  | — | — |  | — | — | — | — |  | — | — |  | — | — | — | 
| Basic earnings (loss) per share | — | 
                                                17.30
                                                
                                             | — | 
                                                29.37
                                                
                                             | — | 
                                                40.02
                                                
                                             | — | 
                                                44.53
                                                
                                             | 
                                                26.98
                                                
                                             | — | — | 
                                                23.00
                                                
                                             | — | 
                                                -1.46
                                                
                                             | — | 
                                                8.10
                                                
                                             | 
                                                4.63
                                                
                                             | — | — | 
                                                -4.63
                                                
                                             | 
| Diluted earnings per share | — | 
                                                17.30
                                                
                                             | — | 
                                                29.36
                                                
                                             | — | 
                                                40.02
                                                
                                             | — | 
                                                44.53
                                                
                                             | 
                                                26.97
                                                
                                             | — | — | 
                                                23.00
                                                
                                             | — |  | — | 
                                                8.10
                                                
                                             | 
                                                4.62
                                                
                                             | — | — |  | 
| Equity-to-asset ratio | 
                                                0.447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.501
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.416
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.368
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.343
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.305
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.316
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.270
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.400
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.353
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | — | 
                                                0.074
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.130
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.196
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.224
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.158
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.139
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                -0.009
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.054
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.029
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                -0.031
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | — | 
                                                21.68
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                12.77
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                9.55
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                8.58
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                12.05
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                14.13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                91.09
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                79.99
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                -79.99
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Payout ratio | — | 
                                                0.361
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | — | 
                                                -91,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                788,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                938,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -206,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                263,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | — | 
                                                -21,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -61,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -312,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -58,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -68,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | — | 
                                                -480,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -210,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -9,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                289,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                180,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                2,152,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,745,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,228,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,612,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,587,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of employees | 
                                                317
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                252
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                252
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                308
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                218
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                266
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                197
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                234
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                216
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | 
                                                66
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                57
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                53
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                69
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                76
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                85
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                74
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                80
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                75
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                76
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Total shareholder return | — | — | 
                                                0.690
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.691
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.589
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.324
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.669
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Total return on share price index | — | — | 
                                                0.949
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.071
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.009
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.287
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.400
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |