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 | 
                                                469,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                914,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                818,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                435,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                100,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                103,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Amortization of goodwill | — | — | 
                                                141,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -32,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                15,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                12,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -10,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -55,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                21,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -28,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                872,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                912,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -15,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                603,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                457,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -111,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -77,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                -642,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -622,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                10,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -865,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -859,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -116,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -72,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                -112,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -133,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -81,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                439,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                625,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -87,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                176,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                1,916,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,740,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,515,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |