Quarterly Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                553,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -181,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                1,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -5,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -64,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -84,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                485,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -223,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -92,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -185,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Loan advances | 
                                                -1,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | 
                                                1,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -124,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -144,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | 
                                                -505,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -310,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -59,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -61,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -405,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                338,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -45,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -29,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                433,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                478,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                508,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |