Quarterly Statement Of Cash Flows
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                540,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,930,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                82,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -119,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -55,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                292,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,581,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -2,395,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,344,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                9,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loan advances | — | 
                                                -915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -8,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -21,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -4,037,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,528,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | — | 
                                                6,351,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                952,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -1,712,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -831,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -72,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                6,006,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                888,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                286,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                2,548,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                941,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                6,502,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,953,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,012,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |