Quarterly Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Quarterly statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                85,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                163,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                64,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                57,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                -243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -28,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -11,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -10,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                47,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                39,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -106,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                26,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                55,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                -82,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                49,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                241,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                241,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                10,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -49,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -11,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -46,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -81,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                205,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                168,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -174,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -219,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Loan advances | — | 
                                                -463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | — | 
                                                823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -220,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -235,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Dividends paid | — | 
                                                -48,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -47,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -48,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -48,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                1,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -61,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -98,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                773,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                834,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,119,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,217,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |