Quarterly Consolidated Statement Of Cash Flows
| Concept | As at 2023-10-31 | 2023-05-01 to 2023-10-31 | As at 2023-04-30 | As at 2022-10-31 | 2022-05-01 to 2022-10-31 | As at 2022-04-30 | 
|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | — | 
                                                1,050,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,055,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                36,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                37,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -94,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -124,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -392,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                962,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                700,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of securities | — | 
                                                -1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of property, plant and equipment | — | 
                                                -514,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -207,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                20,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -222,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -17,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -3,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -2,121,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | — | 
                                                -51,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -75,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | 
                                                -243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -107,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -136,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -160,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -213,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -16,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                35,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,336,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                533,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                4,956,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,292,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,589,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,055,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |