Quarterly Consolidated Statement Of Cash Flows
| Concept | As at 2023-10-20 | 2022-10-21 to 2023-10-20 | 2022-10-21 to 2023-10-20 | 2021-10-21 to 2022-10-20 | 2021-10-21 to 2022-10-20 | As at 2022-10-20 | As at 2021-10-20 | 
|---|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | — | 
                                                185,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | — | 
                                                109,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                116,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | 
                                                -6,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -6,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | 
                                                11,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | 
                                                -2,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                614,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | 
                                                36,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                62,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | 
                                                6,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                209,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | 
                                                206,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -75,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | 
                                                20,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | 
                                                -13,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -13,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                56,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -53,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | 
                                                -71,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -227,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | 
                                                30,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -68,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -232,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Repayments of long-term borrowings | — | 
                                                -200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -196,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of bonds | — | 
                                                -150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | 
                                                -27,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -27,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -22,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                180,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -35,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -104,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | 
                                                137,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                172,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                277,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |