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 | 
|---|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                27,385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,116,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,170,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                10,542,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,991,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                113,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                129,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -4,377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                459,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in retirement benefit liability | — | — | 
                                                -404,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                159,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Share of loss (profit) of entities accounted for using equity method | — | — | 
                                                -262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                23,973,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,651,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -523,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -4,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,647,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                31,733,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,034,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -537,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                1,305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,363,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                4,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,740,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of non-current assets | — | — | 
                                                -144,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -34,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Payments into time deposits | — | — | 
                                                -2,491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,470,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from withdrawal of time deposits | — | — | 
                                                4,047,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment | — | — | 
                                                -13,249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -22,521,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                224,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -88,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -10,045,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,019,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                2,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loan advances | — | — | 
                                                -138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from collection of loans receivable | — | — | 
                                                26,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                166,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                252,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -483,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from short-term borrowings | — | — | 
                                                836,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,826,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of short-term borrowings | — | — | 
                                                -1,791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                -4,017,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,832,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from long-term borrowings | — | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,560,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from issuance of commercial papers | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -7,916,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of commercial papers | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid to non-controlling interests | — | — | 
                                                -367,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Redemption of bonds | — | — | 
                                                -10,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -1,215,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,064,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -25,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -1,203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                587,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                432,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                -2,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,432,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                44,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                47,947,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                46,521,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |