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 | |||||
| Profit (loss) before income taxes | 
                                                564,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                494,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | 
                                                25,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | 
                                                -1,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -84,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | 
                                                5,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | 
                                                -29,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | 
                                                491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | 
                                                409,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                747,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                1,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                84,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -5,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -188,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -193,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                217,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                549,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -44,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -95,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                -47,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -54,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -196,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -159,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -444,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -214,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -322,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                336,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                3,432,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,755,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,419,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |