Quarterly Statement Of Cash Flows
| Concept | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | — | 
                                                680,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                244,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                153,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                174,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -28,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -49,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Foreign exchange losses (gains) | — | 
                                                -1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                75,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                56,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                -290,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,171,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                -26,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -17,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -239,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                222,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                336,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,051,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                4,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -92,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -123,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                264,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,043,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -74,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -75,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -13,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -11,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -189,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -179,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -141,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -106,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -104,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -234,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,099,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -160,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                765,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,839,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,000,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,234,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |