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 | 
                                                3,314,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,063,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,460,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,559,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                285,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -84,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -13,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                20,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                79,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | — | 
                                                88,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                75,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -56,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -11,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,669,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                99,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -97,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                8,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                5,229,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,356,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                13,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -875,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,870,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                4,367,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,494,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -3,132,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -687,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                3,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -35,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -3,334,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -713,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                -159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -1,325,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,178,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -1,419,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,240,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid to non-controlling interests | — | — | 
                                                -58,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -31,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -3,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                18,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -367,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,571,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                20,574,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                20,942,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                18,370,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |