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 | — | 
                                                892,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,511,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                195,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -12,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -653,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -659,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                560,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,006,146,000
                                                
                                                    
                                                        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 | — | 
                                                -472,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -152,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                703,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -314,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -177,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -113,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -767,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from short-term borrowings | — | 
                                                5,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -1,530,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,201,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | — | 
                                                -2,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,757,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -1,163,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -484,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                1,139,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,224,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                375,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                1,961,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -792,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                12,622,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,661,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,453,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |