Semi-Annual 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 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                996,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                957,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,432,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,523,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                107,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                46,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -11,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                5,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                45,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                -50,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                192,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -380,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -107,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -1,665,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                451,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -7,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                586,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,931,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                11,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -5,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -531,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -242,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                60,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,693,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of securities | — | — | 
                                                -200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment | — | — | 
                                                -310,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -131,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                1,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -100,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -200,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                21,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                306,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,170,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Repayments of long-term borrowings | — | — | 
                                                -46,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -212,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                -392,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -65,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -175,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -151,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -629,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -479,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                7,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -253,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                4,162,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,416,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,372,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |