Quarterly 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 | 
|---|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                23,858,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,915,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                39,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                19,436,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                5,808,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                574,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,351,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -3,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,609,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                402,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -870,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                2,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,453,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -13,818,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -18,496,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                7,655,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,079,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                31,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                3,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,543,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -91,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -13,785,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,441,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                20,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,413,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -29,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -33,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -1,877,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                11,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,649,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loan advances | — | — | 
                                                -1,086,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,393,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from collection of loans receivable | — | — | 
                                                566,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                679,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -57,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -22,026,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,428,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                -14,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,998,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -12,595,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,055,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid to non-controlling interests | — | — | 
                                                -142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,870,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | — | — | 
                                                -524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -336,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -17,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -30,085,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                1,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -16,717,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,672,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                26,836,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                42,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                28,270,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |