Quarterly Consolidated 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 consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                172,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                638,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                1,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -23,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                100,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                712,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -392,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -442,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                3,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -9,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -409,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -461,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | — | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                450,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -645,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -755,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | — | 
                                                724,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -20,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                152,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -166,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -156,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,381,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,538,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,454,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |