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 | — | 
                                                2,415,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,991,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,337,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,775,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                1,673,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,621,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                47,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -15,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                69,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | — | 
                                                -118,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -121,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | — | 
                                                53,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                -185,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -145,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                32,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                71,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | — | 
                                                356,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -58,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | — | 
                                                462,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -259,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                -313,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                275,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | — | 
                                                1,352,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,125,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | — | 
                                                133,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                133,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | — | 
                                                -53,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -50,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | — | 
                                                -838,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,294,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                594,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,913,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -960,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,150,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                212,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | — | 
                                                -135,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | — | 
                                                37,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                -542,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                25,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -2,178,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,864,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | — | 
                                                -51,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -214,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | — | 
                                                -690,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -507,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                102,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -480,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | — | 
                                                -3,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                37,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -1,443,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,568,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                6,697,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,093,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,524,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |