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 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                533,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,427,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                76,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                113,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -2,257,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -23,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -1,668,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,509,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -248,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -119,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -3,109,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                2,952,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,562,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -50,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -903,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -2,002,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -452,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -829,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -385,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -47,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -57,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -22,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                11,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                465,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,414,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,986,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,519,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,934,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |