Consolidated Statement Of Cash Flows
| Concept | 2024-10-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | 
                                                493,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                488,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                6,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | 
                                                5,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | 
                                                -1,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in retirement benefit liability | 
                                                -5,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                217,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                607,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                -380,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -167,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                22,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -124,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -69,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                201,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                54,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                93,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                538,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                135,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                30,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -10,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -14,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -11,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -18,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Dividends paid | 
                                                -124,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -124,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -42,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                519,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                2,183,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,226,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,768,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,249,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |