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 | — | 
                                                8,070,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,655,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                479,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -786,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,104,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                7,763,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,898,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from facilities maintenance and investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -3,921,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,830,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                2,303,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -4,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,911,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loan advances | — | 
                                                -2,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -221,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                2,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -2,600,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,262,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Dividends paid | — | 
                                                -1,710,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,776,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -5,224,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,054,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                1,822,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,089,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                1,760,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,196,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                28,452,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                26,599,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,403,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |