Quarterly Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                1,024,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,241,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,002,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                507,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                1,720,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,574,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                791,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -34,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -285,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -247,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                95,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                2,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | — | 
                                                -45,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                1,304,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -991,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                564,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                180,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -1,249,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                957,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -547,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                287,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                3,326,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,383,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                523,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                253,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -102,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -123,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -560,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -536,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                3,275,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,275,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -1,295,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,480,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                913,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -4,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                41,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                496,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loan advances | — | — | 
                                                -2,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from collection of loans receivable | — | — | 
                                                55,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -1,526,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,233,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                -499,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -515,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -493,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -1,917,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,304,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                577,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                306,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                408,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                12,441,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,032,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,989,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |