Quarterly Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | 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 | 
                                                209,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                209,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                124,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                15,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -93,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                1,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                2,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -41,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                4,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                2,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                190,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                144,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                2,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -3,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -5,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                183,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                133,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -59,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -53,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -24,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                20,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -52,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -31,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -2,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                95,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                112,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                770,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                674,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                561,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |