Consolidated Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | — | 
                                                4,012,712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,958,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                761,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                602,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -1,137,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -525,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -17,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -15,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,690,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,092,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -1,014,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -740,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                120,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                91,492,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -2,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -96,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,840,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,381,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | — | 
                                                17,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                43,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                67,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Repayments of short-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -597,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -506,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from long-term borrowings | — | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -286,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -292,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid to non-controlling interests | — | 
                                                -4,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -967,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,765,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                781,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                770,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                1,664,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,717,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                23,068,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,404,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,304,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,081,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |