Statement Of Cash Flows
| Concept | As at 2024-12-31 | 2024-07-01 to 2024-12-31 | As at 2024-06-30 | As at 2023-12-31 | 2023-07-01 to 2023-12-31 | As at 2023-06-30 | 
|---|---|---|---|---|---|---|
| Statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | — | 
                                                1,150,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,559,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                8,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -80,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -65,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                973,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,318,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from operating activities | ||||||
| Cash flows from operating activities | ||||||
| Cash flows from facilities maintenance and investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -241,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -544,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                4,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,618,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -1,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Net cash provided by (used in) investing activities | — | 
                                                -214,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -369,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Dividends paid | — | 
                                                -141,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -163,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from issuance of bonds | — | 
                                                498,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                394,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from long-term borrowings | — | 
                                                205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -472,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -486,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -199,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -153,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Redemption of bonds | — | 
                                                -40,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                492,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                744,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -66,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -51,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                6,063,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,571,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,530,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,786,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |