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 | — | 
                                                2,243,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,039,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                227,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                202,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -14,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -482,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -237,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                1,974,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                992,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -989,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -655,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                1,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -121,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | — | 
                                                289,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                107,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -2,287,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -700,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -10,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -67,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -99,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -177,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -177,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid to non-controlling interests | — | 
                                                -11,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -326,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -240,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                272,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -367,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                220,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                7,579,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,947,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,726,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |