Consolidated Statement Of Cash Flows
| Concept | 2023-05-01 to 2024-04-30 | As at 2024-04-30 | 2022-05-01 to 2023-04-30 | As at 2023-04-30 | As at 2022-04-30 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                1,911,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,658,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                76,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                88,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -322,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -656,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                1,664,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,089,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | 
                                                -3,200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment | 
                                                -1,050,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -290,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -2,576,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                422,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | 
                                                -243,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -36,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -3,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                -445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -107,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -136,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -126,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -214,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -266,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                -16,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -9,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -1,141,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,237,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                5,150,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,292,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,055,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |