Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | — | 
                                                354,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                839,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                660,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,276,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                331,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                322,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | — | 
                                                -3,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -9,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | — | 
                                                10,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -576,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                142,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | — | 
                                                87,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | — | 
                                                153,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                36,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                313,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -24,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | — | 
                                                968,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,123,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | — | 
                                                3,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | — | 
                                                -10,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -8,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | — | 
                                                -451,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -357,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                509,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                766,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -1,823,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -423,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                209,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                688,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | — | 
                                                -95,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -23,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | — | 
                                                100,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                149,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                -71,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -206,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                7,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -1,663,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                418,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                439,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                485,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Redemption of bonds | — | — | 
                                                -62,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -62,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | — | 
                                                -655,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -735,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from issuance of shares | — | — | 
                                                462,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | — | 
                                                -331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | — | 
                                                -144,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -175,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                101,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -425,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid to non-controlling interests | — | — | 
                                                -20,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -1,052,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                759,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                802,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,854,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,095,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |