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 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                8,290,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,836,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,485,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -15,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -270,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -6,786,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -406,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                779,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,987,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -428,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,654,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                292,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                749,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -1,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                -616,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,167,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                442,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from operating activities | |||||||
| Cash flows from operating activities | |||||||
| Loss (gain) on sale of investment securities | — | — | 
                                                -596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -354,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of securities | — | — | 
                                                -7,991,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,998,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment | — | — | 
                                                -231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -243,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -1,795,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                244,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -1,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -19,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                733,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                47,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||||
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                -1,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,683,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -1,958,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -3,765,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -6,177,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,027,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                22,778,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                28,956,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                27,929,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |