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 | — | 
                                                8,380,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,719,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                259,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -2,631,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,616,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -6,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                6,001,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,281,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -1,733,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -384,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,883,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -194,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                6,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                3,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -1,407,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,059,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -253,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -150,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -700,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -213,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                3,274,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,276,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -142,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                402,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                12,647,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,373,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,096,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |