Quarterly Consolidated Statement Of Cash Flows
| Concept | As at 2024-03-31 | 2023-10-01 to 2024-03-31 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-11-01 to 2023-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                488,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                361,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                7,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | — | 
                                                5,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                -5,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -6,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | — | 
                                                -167,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -336,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                50,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -27,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                54,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                150,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                30,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                69,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                607,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                284,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -69,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -89,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                538,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                195,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -14,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -69,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -18,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -65,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Net cash provided by (used in) financing activities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                519,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                129,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,768,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,249,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,119,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |