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 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                3,984,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,949,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -2,719,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -771,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -462,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -661,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                855,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,423,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -750,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -738,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -408,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,568,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                341,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,306,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from short-term borrowings | — | 
                                                115,740,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,701,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -299,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -40,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | — | 
                                                -114,181,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -84,693,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -325,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -108,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                573,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,998,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                286,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                199,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                1,306,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -807,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                6,448,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,141,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,948,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |