Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                12,796,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -967,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                13,935,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,873,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,647,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -1,930,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,853,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                224,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                -174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -2,884,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -4,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,026,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                28,449,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,084,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -5,401,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                2,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                836,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                25,530,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,242,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                2,203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,054,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -95,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from operating activities | |||||||
| Increase (decrease) in accounts payable - other | — | — | 
                                                1,749,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,677,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from operating activities | |||||||
| Loss (gain) on sale of investment securities | — | — | 
                                                -3,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,646,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of securities | — | — | 
                                                -109,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment | — | — | 
                                                -29,259,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,036,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -27,313,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -19,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -958,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,083,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                6,016,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||||
| Cash flows from financing activities | |||||||
| Purchase of treasury shares | — | — | 
                                                -7,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -7,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from issuance of bonds | — | — | 
                                                14,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from long-term borrowings | — | — | 
                                                10,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -5,453,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -4,756,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,823,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of bonds | — | — | 
                                                -8,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -77,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -147,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                -310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,024,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -6,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                57,926,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                64,777,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                53,096,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |